/sqt/ - Stupid Question Thread

I go to cal poly pomona and after a semester after transferring from a CC I decided that I want to change my major. I need to do some pre-requisites to change my major, so I am still a CompE major. I have a hold on my account where I have to talk to my CompE advisor. What do I say my advisor? I'm currently taking business classes.

>>8630251
What number am I thinking of?

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what the fuck is this slashed zero sign?
Here's a definition in which it is used, statistics

>>8630261

Looks like theta.

If I'm a beta, how many other Greek letters are below me?

Is penis size a sex-linked trait? If so, wouldn't everyone's dick be the exact same size as their father's?

>>8630266
it seems that it is, thank you

Can someone link me or show me the proof about when the integral and derivative of the limit of a sequence of functions is the limit of the integral (derivative) of the individual functions?

>>8630275
alphabetically? all but alpha. socially? none.

>>8630251
why does /sci/ smell like reddit?

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>>8630296
what a boy

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>>8630298
Because you have a very strong body odor.

Why does (n (n+1))/2 not work to find sum of an all natural numbers? If you let it equal -1/12 you will get a quadratic n^2+n+1/6=0 which you can solve. And then as n is representing infinity you can give infinity a finite value.

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What's the word for dividing a regular n-gon into n equal pieces like this?

>>8630394
take your pic https://en.wikipedia.org/wiki/Triangulation_(geometry)

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>>8630251
Yes

Hoe do i solve

t * 1/(t^3)

Any ideas

I'm one assignment away from finishing my degree but I can't bring myself to do it. Any advice? Is having generalised anxiety disorder causing my mental anguish a good reason to drop out now?

>>8630483
>Any ideas
Read global rule 2.

say that a vector space V has basis ((1,0,2,0,3)) and U has basis ((1,1,1,0,0), (0,0,0,1,2))

how do I find the basis of U+V?

>>8630483
[math]
$\frac{1}{t^2}$
[/math]

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I'd prefer a hint over a full solution d(:-D)-<-<|8

>>8630571
this is pretty much trivial in both directions, what are you stuck on?

>>8630565
((1,0,2,0,3),(1,1,1,0,0), (0,0,0,1,2))

>>8630565
i found that it's just supposed to be ((1,0,2,0,3),(1,1,1,0,0),(0,0,0,1,2))

but then I can get a vector 2,1,3,1,5 which clearly isn't in either U or V

>>8630591
>but then I can get a vector 2,1,3,1,5 which clearly isn't in either U or V
it doesnt need to be... its in U+V

>>8630590
see
>>8630591

>>8630588
How would I express it mathematically?

>>8630594
okay thanks anon

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>>8630251
Red pill me on the elasticity, deformation, and strength reduction to high carbon steel that occurs when it is exposed to radiant heat well below it's listed melting point from a highly refined petroleum distillate combusting nearby.

Explain to me intuitively how a resistor works. Converting electrical energy to heat makes no sense as a 100 ohm resistor will output more heat than a 1000 ohm resistor, yet still convert more energy.

>>8630614

>100 ohm resistor will output more heat than a 1000 ohm resistor
I don't know if that is actually the case, but why are you assuming the different resistors are made from the same materials? to keep a similar size they are likely not made of the same material
q=mcΔT
as in they'll have different specific heats

>intuitively
go make yourself some toast and look into the toaster.

So I'm giving a vector space, V, over the reals and am asked to prove uniqueness of the zero vector. What does that mean? Some proves online just show that the zero vector satisfies commutativity and QED it.

>>8630622
>I don't know if that is actually the case
Try holding a 100 ohm resistor to a 9v battery. It will get hot within a few seconds. The same thing doesn't happen with a 1 kohm resistor.

Apparently the heat output will be equal to I^2*R. So the reason the 100 ohm resistor is hotter is simply because more current is flowing through it.

>>8630640
suppose a, b satisfy the conditions for being a zero vector with [math]a \neq b [/math].

Then, [math]a + b = a [/math] (as b is a zero vector).

By commutativity of addition:

[math]a = a + b = b + a [/math]

But, since [math]a [/math] is a zero vector, by definition [math]b + a = b [/math].

So, [math]a = a + b = b + a = b [/math], so by the transitivity of equality we have: [math] a = b[/math], contradicting our hypothesis that [math]a \neq b [/math].

(proof is identical for any commutative ring actually)

>>8630676

I see, Thanks.

Also, why is (B) a vector space? Why do they write (x+y+z)+(a+b+c) = 0 + 0 = 0?

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>>8630701
>>8630676

Forgot pic.

>>8630701

subspace*

fucking hell, sucks being a brainlet.

>>8630705
>>8630704
>>8630701
>>8630676

Never mind I got it.

>tfw too intelligent to read

>>8630704
for W to be a subspace the sum of any two its vectors has to belong to W also.

W consists of vectors (x, y, z) where x+y+z = 0

therefore any sum of W's vectors v + u = (x+a,y+b,z+c) must satisfy (x+y)+(y+b)+(z+c)=0

which using associativity rules can be rewritten as (x+y+z)+(a+b+c)=0

but you already know x+y+z=0 and a+b+c=0 since (x, y, z) and (a, b, c) are vectors in W

therefore the equation holds and W is a subspace. (+ is closed on W)

in other words it is a subspace because you "can't fall out of the bounds" of W using addition

>>8630728

this really fires my neurons

thanks anon, this brainlet might actually pass babys first lin alg.

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how do I find the matrix of this homomorphism? I figure I could his rewrite the vectors in B using the homomorphism to F5_5, put the basis into a matrix and multiply B * B'^-1

would that give me the correct answer?

>>8630704
what book is that? looks pretty easy to understand unlike my piece of shit lingebra book

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>>8630755

not a book, but solutions to problems: http://www.math.utah.edu/~kapovich/TEA/2002F/s4.pdf

Also, new question (just for clarification) :Is this notation all the n-dimensional row matrices over vector space R?

Got a grad school interview tomorrow, does anyone have experience to share about how not to go full retard ? I've never interviewed for anything before...

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>An expression with an even number of negative signs is positive, and an expression with an odd number of negative signs is negative.
Not a stupid question, but this didn't warrant it's own thread. Mind is blown, thought I'd share it in the stupid people thrad

>>8630759

https://www.youtube.com/watch?v=XCpW9fY3FkA

found this and he says it's the square matrices.

>>8630771
expression: 8-5
no. of - signs: 1 (odd)
8-5 > 0

hmm

>>8630251
How do i justify what kind of gauss surface to use?

My mother is italian and my father is anglo.
What traits can be used to disern weather any family members aren't the dads?
We're all fairly light skinned and have blue eyes, aside from one of us who has dark skin/brown eyes.
How much luck is there in qualities like this?

How fast can you helicopter dick without it tearing off?

I tried to do an estimate involving treating it as a cylinder of skin with ultimate tensile strength 20MPa L=0.15m and D=0.04m and arrived at 560,000 RPM which seems way too high.

>>8630896
you are only limited by the speed of light, my friend

though, it is ill-advised to go too fast, as length contraction would make your relativistic dickcopter look smaller than it actually is from most reference points

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Anyone have good resources for learning the basics of calculus of variations and optimal control?

I need to learn how to do stuff like pic related.

I need to figure out how many windmills I need if a city use x amount of energy. I know how much one produces (maybe) and how much the city uses, but I don't know how to figure out how many windmills I need.

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>>8631142
If the city consumes x energy and 1 windmill produces y in the same units the cities consumption is measured in and in the same time frame, then, in that time frame you need x/y windmills.

Now, given that x/y < 18, as you are, I would suggest you get >>>/out/

>>8630298

The_Donald is here.

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>>8631149
Thank you very much. I'm not under 18 I'm just dumb.

>>8630374
And if you set the integral of that quadratic equal to the original function you'll really see some crazy shit.

guys pls help i can't into confidence intervals. what do they measure? the probability of the mean to be on that interval? or is it that there is 90% confidence (for example) that after a number of times the mean will be in the interval? or neither? pls respond

Stochastic modelling.

I'm a biofag, can I get a very brief non-technical definition of this?

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>>8630251
Will Trump affect science in any way? Will he give us a base on the moon?

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I feel so stupid, been trying to reproduce this result for several hours today. Wolfram alpha and symbolab were to no help.

My intuition tells me it should be: 1/6 * n(2n2 -3n +1)* delta-X

but apparently that's wrong

>>8630643
>>8630614

[math]P=v^2/R[/math]
P gets smaller when R gets larger.

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why is the probability of both happening not equal to 0.85 x 0.37??? help a brainlet desu

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How do?

>>8631473
P(A U B) = P(A) + P(B) - P(A ∩ B)

>>8631518

no my question was why is 0.85 x 0.37 != 0.25.

well i think the problem is that they are dependent variable so P(A)P(B) does not really work.

>>8631473
that only applies when the probabilities of the 2 events are independent

Hey /sci/, I'm studying computer science and I've found that I've been enjoying my more theoretical courses to those that are taught more practically.

In particular I really enjoyed my course on discrete mathematics, and I'm currently taking and loving my courses on probability, and on algorithm analysis & automata theory. Also taking my first semester of differential equations.

These are undergraduate level courses, so they haven't gone quite as deep into the material as I would have liked. Where can I find some good resources to study topics like these in more detail?

I don't often post here, but thanks for your help.

https://www.youtube.com/watch?v=MITawNjYmMc is thiss cool?

>>8630275
omega

How would you describe the term "statistical moment" in a simple way ? So far I can understand that according to each class of the moment you can understand how the distribution of a random variable looks. Is there any better way to put in simple terms ? Also I have many more questions about simple explanations of other terms such as the method of moments,chi square and other general terms in statistics. If you have any good and not hard to follow book with some examples it would be great you post it. Thanks in advance !

>>8631415
General agreement among the people I've talked to is that if something changes, it will be most certainly for the worse. Regime Trump likes short-sighted decisions that appeal to idiots. Completely defunding pure research on stuff that trailer trash doesn't understand anyway is one of those decisions. I'm honestly kind of scared that the experiment I'm currently working on just gets dropped and I can forget my PhD. It's the reign of the idiots for four years and it's fucking terrible.

What's the difference between textbook on engineering mechanics and a textbook on classical physics?

Is there any statistical way to "prove" causation with statistics? Or you always need to expose a mechanism for the interaction of the variables?

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>>8630597
if G is cyclic then G=<g> for some g. so order(G)=ord(g)=n

if G has an element g of order n then G=<g> since both have n elements

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>>8630739
find the standard matrix
multiply on the left by the one changing the standard basis inside (F_5)^5 to B bar
multiply on the right by the one changing the standard basis in (F_5)^3 to B

>>8631830
multiply on the right by the one changing B to the standard basis in (F_5)^3*

>tfw too much of a brainlet for calc2
>to understand something I have to spend 3~+ hours practicing it and trying to figure it out

>>8631862
Hey, just keep at it. Having to work hard to understand things in math does not make you stupid. Relative to most other subjects, math is very abstract and it's normal to struggle with it at times.

is an engineering technology B.S. worth it ever?

>>8631876
I'm not working hard though I'm copying down the homework and cheating on the online exams and then I cram before the two proctored exams so I can eke out a B like I did in calc1.

I wish I had a teacher ;_;

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>all of the options to transfer from my CC require me to take another year and a half of courses here
Should I just say fuck it and switch to a non-STEM major?

Hey /sci
My math assignment is due tomorrow and I'm stuck on pic related. The question is "Prove the following proposition". We are allowed to use the axioms in the picture and we are allowed to use 0 < 1

>>8631932
nice pic

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>>8631932
forgot pic>>8631935

>>8631938
start with
0<1
apply O4 with z=1/2 to get
0<1/2
apply O3 to this last inequality with z=1/2 to get
1/2 < 1
so
apply O4 with z=1/2 to get
(1/2)^2 < 1/2

>>8631946
fuck i didnt even think about floats. Thanks. i may be back for more

>>8631955
floats?

>>8631958
oh meant fractions

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Got another question I'm stuck on.
Axioms are here >>8631938 and we know 0 < 1
Thanks for the help

>>8631140
Bumping this request.

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When did grass appear? Most sites I can find put it at the late Cretaceous, but some shmuck on /an/ says it was around in the Jurassic.

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What exactly about a substance makes it a good conductor of heat? I mean, if heat is the jiggling of atoms, then why would copper be better at passing along it's jiggling motion than plastic? They're both made of atoms that jiggle. I mean, how could an atom not jiggle if another atom bumps it? The kinetic energy can't go anywhere else.

The number of injury claims per month is modeled by the random variable

[math] P(N = n) = \frac{1}{(N+1)(N+2)}, n \geq 0 [/math]

I want to verify the above function is a pdf. Clearly for all n, P(N=n) > 0. Now we must verify

[math] lim_{n -> \infty} \sum_{N=0}^{n} P(N) = \sum_{N = 0}^{\infty} \frac{1}{(N+1)(N+2)} = 1 [/math]

Using partial fractions I now have

[math] lim_{n -> \infty} \sum_{N=0}^{n} P(N)

= \sum_{N = 0}^{\infty} ( \frac{1}{N+1} + \frac{1}{N+2})

= \sum_{N = 0}^{\infty} ( \frac{1}{N+1}} + \sum_{N = 0}^{\infty} ( \frac{1}{N+2})
[/math]

Is this right so far? is there a quicker way than by using partial fractions?

>>8632396
your first step is wrong

1/[(N+1)(N+2)] is not 1/(N+1) + 1/(N+2)

1/[(N+1)(N+2)]
=1/(N+1) - 1/(N+2)

so the sum looks like
1-1/2 + 1/2 - 1/3 + ...
which limits to 0 and telescopes to give you the 1 you want

>>8632409
Most appreciated anon

>>8630801
more like -----5
no. of - signs: 5(odd)
so it's negative.

>>8630571
How is this a theorem at all? That's literally the definition of cyclic, isn't it?

>>8631380
stochastic - random, due to chance

modeling - as in mathematical model i.e. equation or set of equations used to predict / explain behavior of real life phenomena

stochastic modeling - modeling physical systems taht exibit random behavior; uses axioms of probability

>>8631752
Wrong cuck.

>>8632433
it's certainly not a theorem, it's at most a one-line observation that if a group is cyclic (one generator) then the order of the generator is the order of the group

>>8631791
not a stupid question at all

this article seems like a good start
https://en.wikipedia.org/wiki/Rubin_causal_model

how important is linear algebra for EE? The class is not required to graduate at my school but many professors have spoken of it as if we will take it.

>>8630413
I say, BOTH WALLS!

I see people posting about 10^300 as being the largest number. Is this a meme, or are people actually that retarded?

>>8632671
its from a wildberger video

>>8632671
wasn't it 10^200 yesterday?
or did the universe grow bigger, so that a largest integer grew as well?

>>8630251
how do I learn organic chem in a better way than just rote-learning shit, I come from a maths background and the seemingly mass amounts of things I have to rote learn is pretty discouraging.

>>8632614
It's not required? That's weird. You'll start using it right away. Maybe like week two of circuits.

>>8631417
bumping this since /sci/ can't into math

>>8632922
what step are you confused by?

>>8632924
Where the a3/n3 comes from

>>8632930
what's the setup of the question...what's f, a, etc...?

>>8632937
f is (xi -1)2
Pn is deltaX which is a/n

They are just variables and nothing else

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What would be the outcome of dropping a nuke into an active volcano?

Why is it that for base n, n>9, n is always in base 10?

>>8630251
Does anyone have the Sequences, Combinations, Limits (Dover Books on Mathematics) on pdf?

>>8630255
"I have a hold. What do?"

guys pls help i can't into confidence intervals. what do they measure? the probability of the mean to be on that interval? or is it that there is 90% confidence (for example) that after a number of times the mean will be in the interval? or neither? pls

>>8633274
If I remember well enough it should be interpreted as "we are 90% confident that the true value lies between this interval."

Also I should remind you that you have to be 18 to post on 4chan.

>>8633301
thank friendo

>>8631672

You can intuitively think of it as higher moments giving you information about the way it behaves further from the middle. Odd-number moments tell you about symmetric properties, even-numbered moments tell you about asymmetric properties.

Zeroth moment: total probability = 1 (symmetric)
Mean: where the centre of the probability mass is (asymmetric)
Variance: how wide it is (symmetric)
Skewness: how asymmetrical it is about the mean (asymmetric)
Kurtosis: how thick the tails are (symmetric)

etc.

>>8632267

It's to do with how many free electrons there are. Metals have lots of electrons that can move about the entire structure of the crystal, so they can move energy from one place to another faster than you'd get through vibrations of the crystal lattice. Insulators have no, or very few free electrons, so heat conduction is restricted to vibration only.

Google search these keywords: "free electron model", "nearly free electron model", "tight binding", "valence bands", "conduction bands", "band gaps".

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Appologies for my autism and highlighting of pages but I need some help on measure theory.

What does total algebraic mass index 0 stands for ? Can somebody explain this to me?

Read the green lines.

>>8632944
whats the interval? start making sense.

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What is the difference between laser rangefinders and LIDARs?

>>8633368
>whats the interval?
just look at the equation dah

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Is this accurate?

how does one go about getting experience in labs?
what does it look like?

also

could someone who is currently studying, or has studied, microbiology post their experience?
>what uni?
>what branch of microbiology?
>how much do you study on avg/week?
>what do you want to work as?

>>8630251
Why should I believe in relativity if there is no direct evidence? And if the existence of so called black holes invalidates Einsteinian equations?

>inb4 muh gps

That's not a control experiment that can be verified.

>>8633437
Ice age is iffy too many variables but milankovitch cycle probably causes that which is predictable. Plate tectonics have less variables so it's a lot more likely, there can still be disruptions like asteroids or massive volcanic eruptions that may affect it.

>>8633524

relativistic doppler shifts can be observed with nothing more than a high resolution spectrometer. thermal motion slightly redshifts or blueshifts the light emitted as electrons relax from excited states, and this can be seen as broadening of the spectral lines. it's orders of magnitude bigger an effect than natural broadening or collision broadening.

>>8633557

also we can detect muons produced in the high atmosphere with ground detectors, even though it takes longer from them to arrive than their decay lifetime. this is because they're moving so fast that they are time dilated

>>8633557
This doesn't prove relativity at all.

Also Einstein self admitted that black holes invalidate special and therefore general relativity. Which is why he refused to believe in them. Yet modern t.physic kikery still claims relativity, while simultaneously claiming for bullshit like black holes, dark matter etc.

>>8633561
>moving so fast they are time dilated

Then why aren't our galaxies time dilated? Given your bullshit big bang theory claims we travelled faster than the speed of light initially?

Why do our cosmology equations still pan out, without factoring in for that ftl formation sequence in the early trajectory of galaxies?

>>8633561

relativistic effects must be taken into account when computing the energy levels of electrons in atoms .. it causes fine-structure splitting of the spectral lines.

>>8631752
>The opinions of people that think there are more than two genders and NASA should be doing climate change research as opposed to building rockets matter at all
LEL

>>8633566

black holes are a solution to the general relativity equations, i don't know where you're getting the idea that they disprove it

>>8633568
>Then why aren't our galaxies time dilated

they are

>>8633572
>muh relativism computes energy levels in electrons

Lol how fucking stupid do you masonic faggots think we are? You can't even directly pinpoint the exact position in any given time of an electron, let alone measure its energy level.

>muh probable location of an electron given heisenberg equation has relativity applied

Ya the oh so conveniently tiny gravitational constant can be applied for in equations of which we hardly even know the point/time position of.

You're so full of shit it makes me want to scrap all t.physics divisions and use the money for something useful, like investigating electromagnetism more.

This shit might work with the uninitiated, but with kikes like that pedophile sadist Epstein teaching high level physics, it's not wonder your whole field is filled with tedious and frankly retarded bullshit.

>>8633582
>they are

Yet Newtonian equations without relativity employed work perfectly fine.....

Lol. You got caught in your own fucking bullshit. Relativity should account for planetary positions being off from traditional Newtonian models, yet they don't.

>>8633588
>>8633594

you need to stop reading fringe websites, i'm not going to bother correcting you if you're not going to ask questions in good faith. you're obviously ideologically opposed to relativity as a concept, possibly because of einstein's jewish heritage.

protip: you can hate jews and still think relativity works fine. i do.

>>8633576
>are a solution

No they aren't, because your bullshit big bang theory postulates that the denser gravity is in matter being condensed this can cause a shift outward explosion, similar to neutron star explosions.

So it either sucks in due to space time bend, or it expands. It can't do both. So fuck you and your pedophile masonic physics departments.

>>8633596
>tells me to follow his religion
>offers no evidence

Dude you are literally behaving like a priest. And masonic "scientists" are at the forefront of bullshit like relativity, and other fantastical science fiction bullshit like trillions of galaxies etc.

>>8633597

> the denser gravity is in matter being condensed this can cause a shift outward explosion, similar to neutron star explosions.

this is garbled nonsense. stop copypasting things you don't understand and open a fucking textbook.

>>8633599
>you just don't understand goyim

Then explain, show evidence. Or get your departments scrapped. Because I will fucking bury all physicists who spread bullshit. Us money people don't like inefficient wastes.

>>8633604

i have absolutely no obligation to teach you anything. if you want someone to spoonfeed you, don't insult them. otherwise, pirate a textbook and learn it yourself. i recommend "Spacetime Physics" by Taylor and Wheeler, or "Special Relativity" by A. P. French.

>>8633612
I will get to the bottom of this. And when I do, there will be hell to pay if you people are lying.

>>8633617

if you're willing to learn, good luck. relativity is a tricky subject so you'll probably have questions. many experts will be perfectly willing to answer your questions, so long as you don't go in calling them kikes or agents of a conspiracy. speaking from experience, such people are almost never worth engaging with.

/sci/ isn't always the best place to ask, so if you don't get a good answer here try physics.stackexchange

>>8633628
Well there certainly are a whole shitton of masons engaged in science. Newton, Copernicus.

Many of the well known meme scientists like NDT or Bill Nye are masons.

Proof is rings they wear, and wikileaks leaking members living and deceased of freelodges across US and UK.

>>8633634

well i'm not a mason

>>8633641
But you believe in theories proposed by them.

This is an organization dedicated to secrecy, and obfuscation.

Everything about them and their symbology they employ suggests they like to intentionally expose half truths in order to obfuscate a greater truth.

Coincides with the usefulness of their models. Don't you find it odd how state funded scientific propaganda hails almost entirely masons and jews as the scientific leaders of mankind of the most note?

If nothing else it is fishy.

what happens if i link a very old post

>>3141592

>>8633362
bump please.

$faggots$

How much mathematics do I need to know to do math research? What field requires the least?

I know calculus series, ODEs, elementary linear algebra and some proof techniques. Can I do anything?

This is a weird question, but how were all your social lives while you were in college? I ask this board because of the lack of normies studying STEM fields

When I graduated HS I was a complete neet for two years (because of severe depression) then I decided to fix myself and just go to college. But now I feel the same as I did when I was a neet, my life is just get up --> go college --> come home --> sleep and repeat, everyone doing STEM courses is the same as this from what I gather.

I'll be 25 when I graduate, with four years being consumed without having a social life whatsoever, meanwhile my old friends (who albeit are working shitty dead-end jobs) are having a blast enjoying life. Will I be able to catch up when I finish or does it end at 30?

>>8633641
I'm curious, based on the tesla fan anon'sposts. How many masons do you know?

>>8633799
>When I graduated HS I was a complete neet for two years (because of severe depression) then I decided to fix myself and just go to college. But now I feel the same as I did when I was a neet, my life is just get up --> go college --> come home --> sleep and repeat, everyone doing STEM courses is the same as this from what I gather.

same except i was a neet for just one year

;-;

>>8633805

none as far as i'm aware. im from a LMC family, dont know many rich ppl.

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Could a tortoise, given a hot, humid climate, lots of vegetation and no predators to worry about, ever grow his large?

>>8633799
>but how were all your social lives while you were in college?

Non existent,the key to managing this stuff is having social life in the first 2 years of your uni while cheating for good grades.

>I'll be 25 when I graduate, with four years being consumed without having a social life whatsoever, meanwhile my old friends (who albeit are working shitty dead-end jobs) are having a blast enjoying life.
This is exactly what happened to me and is my reality as we speak.
I am back at my parents after 5 years of uni with no job,broke and not a single friend to even talk to.
I accepted that I wasted my time and there is nothing more to it.

>>8630251
Let the statement, $$(\forall x \in R, \exists y \in R) \ G(x,y)$$, be
true for predicate $$G(x,y)$$ and $$R$$ being the real numbers.
$$(\forall y) \neg G(3,y)$$
$$(\exists y) G(3,y)$$

The latter is certainly true. The former is a negation of the latter. What is the value of the former? Certainly false, or possibly false/true?

How do I deal with post graduate regrets of not studying more/better? Is alchol the answer?

>>8633745
if you mean coming up with something original that will be published, it is not entirely impossible but hard

on the other hand, personal research for self learning is definitively possible.

>>8630571
g,g^2,g^3,...,g^n

>>8634071
>How do I deal with post graduate regrets
Only regret i have was wasting my time on books.
I lost the passion for my profession and I am too late to do something else since ive put 5 years into the uni,i finished it and now am sitting with my dick in my hand.

>>8634089
>falling for the profession meme
I'm glad I got my m.sc in math but I regret not getting better grades so I could get into a phd programme

>>8634100
You have no idea how glad I am for people that got their shit together.
I cant imagine how other people feel in the place I am,it is both sad and pathetic after all the effort put into something.

what's the basis of a subspace where all the vectors are (a, a, b)

I thought it would be ((1,1,0),(0,0,1)) but apparently if the vectors are 3 dimensional then the basis needs 3 vectors

>>8634143
You have the right answer. That subspace is 2-d.

What other ways are there of illustrating causality besides arrows, domino chains and billiard balls?

How does a computer or calculator compute the sine of an angle?

Why does the formula for a sphere's volume have the term 4/3? It seems strangely "clean-cut" compared to pi, yet it accounts for a circle being rotated through its diameter (and the solid of revolution that results).

>>8630276
Or maybe it's the size your mum's would have been, if she was born a boy.

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I don't get this

How does the 1/4 turn into 1/12 and the other one is -1/12

Where does the 3 come from ?

>>8634304
integral 1/4 1/(2+3x) dx
= integral (3/3) 1/4 1/(2+3x) dx
= integral 1/12 3/(2+3x) dx
...

>>8634223
i think it either uses approximation formulae or has a lookup table of values

>>8634223
taylor series

>>8634316
I think I get that but what is the point of that? I can just do the top integral, why do I need to put a three on top and change the constant in front for seemingly no reason ?


I could just get 1/4 (ln |2+3x| + ln |2-3x|), right ?

Is the complex plane just a handy metaphor for cartesian co-ordinates, and i just an arbitrary symbol that could be replaced with literally anything?

>>8634336
Get yourself a copy of baby rudin, and read the section on the complex field, beginning on page 12.

>>8634331
because the derivative of 1/4ln(2+3x) is 1/4 3/(2+3x), which is not the original integrand 1/4 1/(2+3x)

>>8634344
How do I know which number makes it correct though, like in this case it's 3.

Where does the 3 come from, how do I get that number ?

>>8634358
the derivative of ln(ax+b) is a/(ax+b) so the integral of 1/(ax+b) is (1/a) ln(ax+b)

>>8634362
thank you for helping this humble brainlet out

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Quantum Mechanics Homework - Question on Wavevectors and Wavelengths. Question in pic, my attempts on related things in reply to this comment. Any help like directing me to relevant notes or a worked example, or doing out a solution is appreciated

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>>8634412

>>8634412
use a formula

>>8634423
do you know what to do and are being vague to motivate me to figure this out or are you just shitposting? If its the former, do you know for the 'draw out (i) for t = 0' part of the question, is he saying the wavefunction is 1 so i should normalise it by letting the integral = 1 or what am i even being asked? Im a bit confused

>>8634304
O.o
Dude

a * \int f(x) = \int a*f(x)

>>8632893
yeah im in circuits 2 and embedded systems class for EE. What exactly is needed for circuits from it? Ive covered vectors and some matrices from calc 3 already.

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If water is put inside a warm sealed box will the water eventually completely evaporate or will it stop evaporating once the air inside the box reaches a certain level of humidity?

>>8634608
The water will evaporate until it reaches equilibrium with the air. At that point the rate that the water evaporates will match the rate that it precipitates back into a liquid. if that interests you it won't for long because you'l spend months and months and months on equilibria in any chem-related course.

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>>8633486
p-pls respond

>>8633486
Ask professors if you can volunteer in their lab. Easier to do if you're one of the top students in a class they teach. Even then, they're stingy because they don't want to get sued.

How do I know if I'm gonna make it or not?

>>8634336

No. A 2D coordinate plane doesn't tell you how to do arithmetic with the points. I can give you a Cartesian grid and highlight two points on it just fine, but if I tell you to multiply those points you wouldn't be able to unless I also told you what the rules are.

Complex plane is where you have the plane, plus rules for how to add, multiply, do exponent, etc. In particular for multiplication it tells you to multiply the radii from the origin and add the angles from the real axis. Multiplication by i means rotation 90 degrees anticlockwise.

If you have a 2D plane with different arithmetic rules it isn't the complex plane anymore.

>>8630609
elasticity should increase.
Strength should decrease.
Deformation is usually in relation to some kind of stress applied at non-melting temperatures.
Check out creep.
From your combusting nearby there could also be some chemical changes like hydrogen embrittlement or just plain rust embrittlement.

Sooo
Strength reduces in high strength steels because it removes any cold working that was already done to the material.
At the crystal level, this removes discontinuities like line discontinuities, that contribute to strength of materials (they end up interacting with each other, basically locking in place, so that atoms don't move against each other)
At the grain level, this removes any anisotropies in the grain shape which may have been added by cold working.
These anisotropies will make it stronger in one direction.
Also heating up a material (to around the annealing point, which by rule of thumb is approx 1/3 melting point) increases grain size, which also increases ductility, but decreases total strength.

Can you take say a bar magnet, and wrap wire around it, run a current through it to make an electromagnet to add the magnetic and electromagnetic fields together?

is probability a good research area? i really like this area

I am taking a theoretical physics class and i think i'm gonna fail even though the semester just started. It covers things like series, complex numbers, jacobians, transforms etc. and how they apply to physics systems. Does anyone know a resource that i can use to get better at this? I've tried kahn academy but it doesnt give any results and googling theoretical physics is a dead end too. My textbook is good but it feels like i don't have enough examples to solve the more complex problems. The professor just goes through the examples in the book word for word so I'm not really getting any new insight. The textbook is Mathematical Methods in the Physical Sciences by Mary Boas.

Whenever I do a certain problem I end up with the correct answer but when the numbers change slightly and i use the exact same method i get the wrong answer. I constantly recheck my work but it feels like i'm getting nowhere. Homework is assigned but teacher is secretive and doesn't give solutions back to us.

I don't know what to do or how to even start some of the more complex problems. Any help will be appreciated.

Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next. When you increase your speed by 8.5 mi/h , the time to go one mile decreases by 15 s .

I can't think right now

>>8634933
my professor was doing some stochasitcs research

I've been stuck on a simple elementary school tier problem everyone on google has got it wrong too

Prob of event A =.5
Prob of event B =.7
Prob A and B = .4

If event A doesn't happen at all what is probability event B happens?

I thought this meant P(B|notA)?? am I mistaken
I've already tried .6, .57, .7 all have been wrong

>8635090
try 0.1

>>8635001

Wow. That sounds like my entire undergrad experience. I was not in physics though.

My physics friends said they had a cheating ring and would not have passed without it.

Maybe make a friend to study with.

>>8635262
fuck that was wrong too. I only have one last attempt now why is this problem killing me :(

>>8635090
How about you identify WHEN/WHAT THESE PROBABILITIES ARE!

Holy shit. There is no such thing as a simultaneously probabilistic event that isn't generated within a computer. DEFINE YOUR PARAMETERS BETTER BEFORE YOU USE MATHS.

Anyone have some resources to teach simple machines to a retard?

>>8630251
Let [math] f: \mathbb { R } ^2 \to \mathbb { R } ^2 [/math] be defined by [eqn] f = \left ( xy, \frac { x^4 } { x^2 + y^2 } \right ) ~~ \text { if } (x,y) \neq (0,0) \\ f = (0,0) ~~ \text { if } (x,y)=(0,0) [/eqn]

Is [math] f [/math] continuously differentiable?

It's not, right? I took [math] {\operatorname { D }}f [/math] and then showed that at least one of the elements diverges.

>>8635319
WHY DO PEOPLE KEEP SQUARING THINGS?!

Goddamn. Have some obvious maths.

-1+
/2*
^3!

Now fix your stupid equation.

Time crystals.

>Normal crystals have an atomic structure that repeats in space - just like the carbon lattice of a diamond. But, just like a ruby or a diamond, they're motionless because they're in equilibrium in their ground state.

>But time crystals have a structure that repeats in time, not just in space. And it keep oscillating in its ground state.

>Imagine it like jelly - when you tap it, it repeatedly jiggles. The same thing happens in time crystals, but the big difference here is that the motion occurs without any energy.

>A time crystal is like constantly oscillating jelly in its natural, ground state, and that's what makes it a whole new form of matter - non-equilibrium matter. It's incapable of sitting still.

Dues this mean by changing the oscillation of the material we can talk to the future and get advice from future generations on the past this avoiding mistakes and changing the timeline?

>>8635385
Aaaah fuck, someone is getting close.

If it helps I actually describe this in the book I wrote. I know it is fiction/fantasy, but...

*SIGH*

2 dimensional entity = crystalline structure (filter)

3 dimensions = projection of 'energy' through that 2 dimensional structure/concept.

Rinse/repeat.

Can I please have a cheque now?

>>8635385

I just find it so weird that I took 3-4 physics classes in college and understand absolutely nothing described in these new physics tech (quantum computers, time crystals, etc).

The frustrating part is that unlike other tech, there does not seem to be consensus in physics. Half of the available experts seem to argue that these things do not exist while the other half say that they do.

So weird.

OK, then how about FTL communications with other civilisations?

As described in science fiction books by David Weber, could gravitational waves be used as a way to communicate with far off alien societies.

Now that we can detect gravitational waves, is a grab wave generator possible?

Then could grav waves could be used as a crude com signal?

>>8635472
No, gravitational waves travel at the speed of light.

>>8635001

>Mathematical Methods in the Physical Sciences by Mary Boas

there's your problem

get "Mathematical Methods for Physicists: A Comprehensive Guide" by Arfken & Weber

>>8635001
>>8635618

Some other resources that were helpful to me in physics undergrad:

http://hyperphysics.phy-astr.gsu.edu/hbase/index.html
http://tutorial.math.lamar.edu/
http://physics.stackexchange.com (just google "site:physics.stackexchange KEYWORD" and there'll almost certainly be an answered question about your topic if it's at undergrad level)

also could you give some examples of problems you're having trouble with?

>>8635090

use P(X|Y) = P(X ∩ Y)/P(Y)

What happens when you dissolve a substance in a liquid? Does the volume of the liquid increase? Or does the substance "disappear"?

Doing basic chemistry problems.

Could mass or energy escape a black hole if two black holes would collide, nullifying the Schwarzschild radii between them the moment(s) before they touch?

can someone explain what a dual space is?

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What'd I do wrong here boys? Help much appreciated

>>8635918
why is the radius 3 feet at the bottom and 6 feet at the top? is it non-cylindrical or am I reading the diagram wrong

>>8635924
Yes it is non cylindrical, i.e the radius changes as you go up

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Can somebody succinctly explain to me why the - is added in front of (12-24) in the fourth line please?

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I'm sorry for the stupid question, but would you mind telling me where I did a mistake in my thinking?
So one machine takes 2a to fill up the whole pool, the other one takes 2b to do the same. Then if they're turned on at the same time we take the harmonic mean, and [math] \frac{4ab}{b+a} [/math] remains. But I tried googling and everyone gets 2ab instead of 4ab on top.

>>8635912
The dual space of V is the vector space V* consisting of all linear transformations from V to F (the field V is a vector space over).

>>8635930

You've got the formula for the radius of the volume element wrong. It's not x = 3y/4, that would be if it were a cone.

It should be

x = 3 + ((6-3)/8)y = 3 + 3y/8

>>8635951
2ab? That is also wrong. If one pipe takes 2a hours and the other takes 2b then together they should take less. So if x is the time they take,
x < 2a and x< 2b

>>8635965
what does that have to do with covariant and contravariant vectors?

>>8635933

the [3(x^4)/4 -6x^2] from -2 to 0 means you need to substitute 0 for x, and then -2 for x, and subtract the second from the first. Putting 0 in the expression just makes it zero, so there's only the subtraction term to worry about. The subtraction means there's a minus sign in front.

>>8635644
that gave me .4/.7 which comes out to be .57 which has been counted wrong

>>8636002
you forgot to divide by P(¬A), the answer should be 0.286 i think

>>8635995
Holy shit so it's (x=0) - (x=-2) and not the other way around?

>>8630251
How do I keep my intelligence and push my creativity further?

>>8636019
yeah top limit goes first, then the bottom limit.

>>8635951
Let V be the volume of each equal section. Pipe A fills (V/a) volume per hour. Pipe B fills (V/b) volume per hour.

In one hour, the pipes, together, fill (V/a)+(V/b) volume.

Let the number of hours be x. In x hours, the pipes, together, fill (xV/a)+(xV/b) volume. Set the following equation:
(xV/a)+(xV/b)=2V (where 2V represents the whole swimming pool). Find x, it will be 2ab/(b+a).

>>8636021
stop playing video games

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>>8635267
I don't want to cheat though. I feel pretty stupid but if i cheated i think i would feel downright retarded.

>Maybe make a friend to study with.
lol


>>8635618
>>8635626
Thanks these are helpful and it is undergrad level.
This is one of the questions. I'm not even sure on how to start. I know its a center of mass problem and that if the book is too far to the right then the stack would fall but i couldn't figure out how to do that mathematically. I also don't know how adding more books changes the equation.

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To anyone doing lab work
What are some things you do daily?
Anything you love about or doing in the lab?
Anything you hate?

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Are any of the creatures depicted here plausible?

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Is this problem supposed to be this tedious?

Finding the area of the region between two functions

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>>8636039

I get that you're not really interested in the answer itself, instead you're having trouble thinking about how to formulate and reason through problems. It's no surprise, because this is something that's very difficult to teach, and a lot of the time just posing the problem correctly gets you 90% of the way to solving it. Any answer I give won't be able to teach you how to solve the next one if it isn't a plug-and-chug question.

For what it's worth I've written out my thought processes as I went about solving this. Does this make sense to you?

A good book you might want to read is "How To Solve It" by George Polya. It helped me quite a bit. Either way, keep at it.

>>8631909
ST are memes EM are not memes

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>>8636128

hint: the middle integrand is the same as

- [ g(x) - f(x) ]

>>8636157
So the third integrand alone would've given me the correct answer? Interesting

>>8636164

not necessarily, it depends on what the functions are. point is, you can just solve the integral once and put the limits in afterwards, saves you writing it out three times.

>>8636035
How so? I always assumed video games can make you smarter in some ways.

>>8636185

even if that were true (it's probably not), it's not a very efficient use of your time. two hours spent studying or exercising or socializing IRL is better for your mind than two hours in a video game.

Help me visualize 5 dimensional space

>>8636174
I'm not sure what you mean

I could solve just the third integral then And use the limits -2 to 2?

A[1,2,2] and B[2,3,0] lie on p
C[4,0,5] and D[5,1,2] lie on q
p and q are skew lines and (1,2,3) is the direction vector of their transversal r
R[?,8,?] lies on r.

how do I find the distance |C,R|

I can't get this going at all

>>8636204

solve the integral g(x) - f(x), then put in the appropriate limits three times, then add the results.

if your functions had nicer symmetry you could combine them, but in this case you can't.

I have a 3.2 cumulative GPA, a bachelor's degree in micro biology and currently doing a post-bac year to obtain a second degree in general science

how fucked am i?

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How do you give proof for this equality?

idk if someone here remembers me, i posted a week ago asking how i would learn some basic general chemistry topics in one week. Someone suggest khan academy
I watched the whole thing about oxidation reduction and acid base theory. Thought i had learned it.
Woke up, tried to do the exercise sheet and now i know i didnt learn shit.
What to do /sci/? My exam is monday and i needed at least a 7-9 score on it
What i'm doing wrong?

>>8636203
https://www.youtube.com/watch?v=eyuNrm4VK2w

>>8636009
could you explain what you are dividing by not a?

I'm going in circles here so

we want P(B|notA)
which is: P(BandnotA) / P(notA)

right?

P(BandnotA) = (.7 *.5) = .35
diving by not A gives me .7

which was wrong

>>8635309
Fine. I just didn't wan to feel like cheating

>Two computers are connected to a password-protected wireless network. When the password is temporarily removed, a virus can attack the first computer with probability 0.5, the second computer with probability 0.7, and it can attack both computers with probability 0.4.
>first not attacked, probability second was attacked?

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>>8636244

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>>8636203
You exist in the 3rd, so start with visualizing the 4th dimension, try pointing a finger at it. No matter which direction you point you are correct, it is temporal and could be considered past or present. So whichever direction you point would be absolutely correct. You just don't see large expanses of time all at once, as easily as if by moving your head around. As a 3rd dimension being you are a "slave" to that 4th dimension.

I can't describe what it would feel like to be a 4th dimension being other than just saying you could walk through time as if it were a dimension, but not necessarily able to see every bit of it at once, similar to how we can't see through obstacles in the 3rd. So as a 4th dimensional being, the 5th dimension would be your temporal dimension, the one you're a slave to, the one you perceive as the passage of time. The 5th could be thought of as all versions of a time line - like say the multiverse - but you'd not be able to step through them or change them, but you'd be aware of the different ones and could view them without interaction. Just like how that one guy in MiB was who could view the different realities for a moment, could guess the likely possibilities, but couldn't tell you which one it was gonna be, but once it happened he knew which 5th dimensional multiverse reality you were on. I realize if you haven't seen that movie it must sound weird.

Applying this to a 2nd dimensional being in flat land, you'd be stuck inside your computer monitor. Your temporal dimension would be 'depth' the one you are a slave to, and would experience your monitors "refresh rate" as time pulsing along into the depth dimension, stacking monitor after monitor right? Your own personal refresh rate could be sped/slowed as you approached the speed of light relative to other flatlanders. For you to jump into the 3rd you'd have to have a refresh rate greater than the speed of light or infinite monitors sticking out into "your" room.

Is gravity instantaneous, or does it travels at the speed of the light?

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>>8636257

my mistake. it's easier if you draw a Venn diagram. the answer is 0.6.

>>8636243
http://math.stackexchange.com/questions/177091/int-infty-infty-eikxdx-equals-what

>>8636291
speed of light.
they detected gravity waves recently, didnt they?

>>8636302
thanks for helping me out

I got that by accident last night it said it was wrong too. Maybe theres an error by the prof.

does this over here change anything>>8636262
I posted the whole thing. The answer is still .6 right

>>8636330

are you using an online homework thing? maybe it wants it as a fraction or a percentage or something.

>>8636341
yeah I'll try that when I get back home. Thanks again

>>8636070
wtf is a brainlet?

In formal languages/group theory, with the following regular expression:
r1 = aabb* +abb*

would this mean:
L(r) = {aab o b* U ab o b*}
or
L(r) = {aab o (b* U a) o b o b*}
?

When they aren't in brackets, are only the last and first elements treated by the operator? Or do you still take both statements as 'blocks'?

>>8632119
>>8631140
Anyone?

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>>8636311
That 2a is bothering me.

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>>8636398
Sorry, I was missing a c

>>8630483
What the fuck is that expression equal to? You can't solve for t if the expression isn't equal to anything

>>8630519
Close 4chan and get to work now. It's one fucking assignment and you're FREE, so just do that shit nigga

>>8636417
integral over infinity of sinc is pi, so the 2 should be there.

>>8636291
>>8636325
Yeah at the advanced LIGO. Neat experiment.

>>8636423
But I'm not integrating sinc

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>>8636138
I understand! Thanks for the explanation. Will definitely check out the book.

Also in pic related theoretically the series would diverge since there would always be a spot to place the (n+1)th straw. In order to have the straws be level the tension of the string (upward force) would need to be the same as the force of gravity.

>>8636473
yeah that's it!

>>8636488
Thanks Anon.

>>8636273
amazing

>>8636203
>>8636273
This explanation is wrong, contextually.

Easier to use this animation to describe 'fifth-dimensional space'

https://www.dropbox.com/s/e01dn5azu1i257o/9b7452_92b43b11dd434019a428d7ff2396f3df~mv2.gif?dl=0

>>8636379
Pls

>>8636606
Hmmm, I've never asked this question before: What's in it for me?

Any excel users here?
How do I reference a value from a different sheet, but instead of providing the sheet name, I want to store that sheet name in a cell?
So, for example, instead of typing
=sheet_name!F12
I want to do A1=sheet_name, and then to use something like
=A1!F12

But this doesn't work. Can I get it to work somehow or is this not doable in excel?

>>8636623
I don't know why people keep thinking they can side-step me. Be a bit more direct. I'm a nice person. Not strange for me to ask what would be in it for me.

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can there be more hydrogen environments than integration numbers in an H-NMR?
i'm supposed to determine this chemical: it has 4 carbon environments, 2(?) hydrogen environments, a strong absorbance at 3300 IR(-OH i think), and is C4H10O. HDI is 0 if you don't feel like calculating.

>>8636639
Hello also works you know.

Nice penis by the way.

Can someone explain to me what "an isometry that fixes its origin" means?

>>8636653
isometry = function f which is distance preserving
fixes its origin = f(origin)=origin

I have an idea that involves solar panels, can anybody recommend some books on solar energy/clean energy sources?

>>8636662
hm, I guess I should have specified

What I meant is: I can imagine some set of points of R^2 being moved while preserving their distance, but I'm not sure of what the implication is of changing the origin

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>>8636688
https://en.wikipedia.org/wiki/Euclidean_group#Overview_of_isometries_in_up_to_three_dimensions
in R^2 the isometries are
>rotations around a point
>translations
>reflections across a line
>glide reflections
and each isometry can be written as a rotation or reflection (so a choice of orthogonal matrix) composed with a translation (choice of a vector)

so in R^2 the originfixing isometries are the rotations around the origin and reflections along a line going through the origin

I currently own a kindle, and it's nice as fuck except for one thing. Math formulas don't look as good so I would like some recommendations on E-ink readers which are better for /sci/ related subjects such as Math and Physics.

>>8636724
If you just translate a point A to A' why doesn't it make it origin fixing? How does it change it?

>>8636743
a translation moves every point by the same amount

i.e. translating (0,1) right by one unit to (1,1) also moves the origin (0,0) to (1,0)

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1st year transfer student at Ucla majoring in EE. Considering switching to CS or CSE. Should I do it lads? I just want to make the most money after I graduate

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What tool to solve pic related? I know how to do it, it's just really tedious by hand. I'd put it into an n x 1 matrix on my ti-84, but it doesn't do phasors in matrices.

>>8636761
Have you looked at jobs? I'd imagine there's a shit ton of ads for CS people in your area, there's way more opportunities in my area for cs than there are for engineering. Engineering is an old man's game.

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Why does alcohol make people feel happy?

>>8630255
Tell them you want to switch majors??? Damn kid you're going to need better problem solving skills than that at CalPoly.

>>8630413
>Make a sign to ostensibly convince someone of something
>Dress like a weirdo that no on in their right mind would take seriously
Seems like it defeats its own purpose.

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>>8636884
Because it's killing them.

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I often read about how college is a scam, and not everyone should go.

I agree with this 100%. However, college is fucking cool and studying maths professionally sounds dank af.

But at the same time, it could be upheld as a hobby. What convinces you, anon, to stay in school despite knowing it's an overpriced scam?

Suppose we have two schemes Y,Z over a common base B.

Suppose also that we have etale covers {Y_i -->Y} of Y and {Z_m --> Z} of Z.

Can we use these etale covers of Y and Z to define an etale cover of the fiber product Y x Z over B?

>>8636926
>hospitals keep people alive longer
>99% of people in a hospital are miserable
Checks out.

>>8636950
go to bed jake

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Why do people dream?

>>8630298
Because it's /sci

>>8630300
>almost
Why only almost?

>>8636985
It is Saturday.

>>8636990
No one?? Damn /sci/ doesn't know shit.

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Okay, I'm having trouble witha simple physics problem:

The problem asks "What's the acceleration between the two blocks (which are connected by a pulley system)?" When I found the net force, the system moves in the direction of the 100kg block.

But here's where my problem lies:shouldn't the acceleration of the two blocks with different masses be equal? Intuitively, it seems difficult to see how F_net = ma applies here when the net force in the system will give different accelerations...

What am I doing wrong?

>>8637195
>Damn /sci/ doesn't know shit.
no shit

>>8637300
It was the one moment in our lives that made the my brother wa not as strong as he belivived. it was the moment that nmade everyityhing else possilble

>>8636754
Ah alright, so it's always an R^2 to R^2 function?
Meaning it's transformations on the metric space "with" the object to another metric space, not the object alone?

>>8637446
>Ah alright, so it's always an R^2 to R^2 function?
no, a function f from any metric space X to any other metric space Y satisfying d(f(a), f(b))=d(a,b) where the distance d is measured on Y and the second distance d is measured on X

>Meaning it's transformations on the metric space "with" the object to another metric space, not the object alone?
i dont know what you're trying to say here

>>8637453
If translating a point also moves the origin that it implies it moves the other points of R^2 too

>>8637463
>If translating a point also moves the origin that it implies it moves the other points of R^2 too
yes that's true

i'm still not sure what you originally meant

>>8637474
I meant that if given a translation such that for A=(0,1) -> f(A)=(1,1), and the transformation involves all points in R^2 so that

(0,0)->(1,0)
(1,0)->(2,0)
(2,0)->(3,0)
etc.

then it's projecting a space onto another space, maintaining distance between each point of any given object

I don't know why I'm confused about this shit, it's just that I don't find details about it

>>8637491
it just sounds like you're explaining why a translation is an isometry (which it is)

i'm not actually sure what you're confused about

>>8637496
My confusion stemmed from the fact that I didn't get how an action on a point A (like translation) can affect the origin if it's only an action on a point A, meaning 0 "stays there"

But I guess the definition of "a function not fixing the origin" was to be read as simply "if you do the same shit on 0 it will move" basically

>>8637504
>>8637504
>My confusion stemmed from the fact that I didn't get how an action on a point A (like translation) can affect the origin if it's only an action on a point A
mmm now you seem confused, you cant 'only' translate at a point A. a translation moves the entire plane at once, in one direction

>>8637507
No I know, like I mentioned above

I just had some issues about what this implies theoretically, but I'm getting it (I think)

Still, it says that origin-fixing transformations maintain the norms of any vector, but doesn't that work the same for non-origin-fixing transformations other than vectors fixed on the origin? (i.e. v=0-P -> (v=0-f(P))

>>8636205
anybody?

prof said the correct answer is supposed to be sqrt20386 but that looks like a major typo to me

>>8637271
the net force is applied to the combined masses, not the individual masses

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Could anyone give me some hints on this one? Are you just supposed to solve the integral and subtract with Pi/4 ?

seriously though, why can't atheists define atheism?

>>8630259
[math]\aleph_{-\frac{1}{12}+7 i}[/math]

>>8637531
>>8637531
Okay... Then to find the acceleration, would I do:

Mass 1 Net Force = (Net Force / Mass1+Mass2) * mass1
and
Mass 2 Net Force = (Net Force / Mass1+Mass2) * Mass2?

>>8637586
Literally go to a dictionary, it's a very simple definition.

>>8637864
Net Force / Mass1+Mass2 is the acceleration of both bodies

the equations you provided would yield a force with "Mass 2 Net Force" being the tension between Mass 1 and Mass 2