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Archived threads in /sci/ - Science & Math - 1300. page

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Name that function.
15 posts and 3 images submitted.
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>>8431754
looks like you've taken the bottom/top half of a sine curve (per cycle) and rotated it 45 deg. Also top half for x less than 0. Guessing you could assemble that using modulus functions and some matrix rotations
>>
F(x)

/thread
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>>8431757
What makes you call it an antiderivative, HMMMMMMMMMMMMMM?

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Can you guys help me with my home work? A random polynomial P(x) is given. When the limit of P(x)/[x 2-4] tends to infinity it equals 4 when it tends to 2 it equals 9/4. I gotta find the polynomial P(x).
15 posts and 1 images submitted.
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X 2 is supused to be square x
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And in the last lim of the pic it's supposed to tends 2 not infinite
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The numerator has a 4x^2 term

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>go to the moon only once and never go back again in the past 50 years
>why build a colony on the moon when we can build one on Mars for 100 times the cost!
18 posts and 2 images submitted.
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>he fell for the moon landing meme

The technology wasn't advanced enough back then that it would've been possible to go to the Moon. Also, in the original footage the American flag is clearly fluttering in wind, even though there is no wind on the Moon. It was all a hoax to win the space race without wasting too much money.
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lol good thread :DDD
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>>8431804
You think you can tell if the moon landing was a hoax but the KGB couldn't? Lol

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What's the silliest explanation for a natural phenomenon you've ever encountered?
18 posts and 1 images submitted.
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>>8431491
God
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>>8431491
How you were born
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>>8431491
evolution

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What is the reason that when different powers of the same quantity are multiplied together their exponents are added?
13 posts and 2 images submitted.
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X^3= x*x*x
X^2 = x*x
X^5=x*x*x*x*x

2^2=2*2=4
2^3=2*2*2=8
4*8=32
2^5=2*2*2*2*2=32
>>
It's just a standard rule of mathematics.
When multiplying with like bases, exponents add.
>>
x^3 = x*x*x
x^4 = x*x*x*x
x^3*x^4 = (x*x*x)*(x*x*x*x) = x*x*x*x*x*x*x = x^(3+4) = x^7

ya dingus
alkynes of retarded.bmp

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sqrt(x) = -sqrt(x)

prove me wrong
12 posts and 2 images submitted.
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[math]\mathsf{It\text{'}s~now~safe~to~turn~off~your~computer.}[/math]

[math]\mathsf{It\text{'}s~now~safe~to~turn~off~your~computer.}[/math]

[math]\mathsf{It\text{'}s~now~safe~to~turn~off~your~computer.}[/math]

[math]\mathsf{It\text{'}s~now~safe~to~turn~off~your~computer.}[/math]

[math]\mathsf{It\text{'}s~now~safe~to~turn~off~your~computer.}[/math]

[math]\mathsf{It\text{'}s~now~safe~to~turn~off~your~computer.}[/math]
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>>8431349
True when x =0.
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>>8431349
y=sqrt(x) is really just y^2=x which is reflective about the x axis, so yes that is true.

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Alright nerds, the Sun is about to crash into the earth, but thankfully you have a carbonfiber bunker.

You're allowed to take 10 items with you into the bunker, 2 years from when you enter you will be allowed to leave and rebuild/repopulate the earth as you please. Don't worry about women, the bunker is already equipped cyrotechnically stored women.

What do you take with you, /sci/?
29 posts and 3 images submitted.
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>>8431236

>sun is about to crash into the earth

what?
>>
>>8431236
Putting aside the retarded premise, because the earth wouldn't even exist after collision with the sun, let alone be inhabitable (I'll pretend everyone died of super-ebola or something)

1 credit on a laptop with as much relevant information as you can about surviving and rebuilding when you get out. Some games to play too so you don't go insane sitting in a box.

1 credit on a big bag of assorted seeds so you don't have to start harvesting wild stuff when you get out.

Spend the rest on gigantic containers of food/water. You probably could survive with only 2 food items and water but it would be really fucking boring eating nothing but olives and rice for 2 years straight.
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>carbonfiber bunker
>implying this will help you

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I don't understand evolution.

The mutations are totally random right? So why are they so "perfect" for their environment?

For example the super pale skin common with the Irish had an equal chance of mutating in Africa. And it's not as if it's a particularly beneficial or detrimental mutation. A pale Irish guy can survive fine in Nigeria and a super dark Nigerian will do fine in Ireland.

So why come there aren't super pale light skinned people in Africa (albinos don't count or do they)?
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>>8431120
the mutations are random
the selection is not
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>>8431120
That AT&T bitch is fucking fine, but she can't act to save her life.
>>
>>8431120
>protection against cancer causing radiation is not particularly beneficial in a location where the sun's always out

Also, blacks use albinos in all sorts of rituals, so you can bet your ass it was better to be a darkie.

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>tfw recently got selected to intern at a respected government-sponsored lab in my dream state for the Spring '17 semester

Is my fucking nightmare of an undergrad career finally going to take a turn? Or am I mistaken?
14 posts and 2 images submitted.
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>posting on /sci/

Your career was over before it even started. Congratz, you played yourself.
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>>8431001
>he thinks life gets better after college
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>>8431001
SULI?

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Would anyone be able to help me out? I'm taking a gap year right now in order to earn enough to be able to afford college and will be beginning as an undergrad majoring in Chemistry next fall. I've got a scholarship that requires me to maintain a 3.5 GPA each semester, but even with this gap year I'm going to have to work likely full time to be able to afford all four years. I'd like to start self-studying now that I have some free time when I'm off of work and so that I can make sure I maintain that GPA requirement with ease. Can anyone recommend a series of books/resources that will sufficiently prepare me for undergrad and maybe make life a bit easier for me through my next four years? Also if you know of any problem books or can recommend really any prep for what I'm going to be looking at? I really appreciate any help you can give!
16 posts and 2 images submitted.
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If you're able to access the course lookup feature for the current or next semester in your student login, search for the courses you plan on taking your first semester. Get some names of the people teaching these classes and put them in Google with your school name. You can typically find their website where they post syllabus, homework problems, notes, etc.

A lot of times they post their notes in their entirety (especially for lower division lecture-hall type classes), and you can work through them without having to even buy the book.
>>
Also, check the sticky. Lots of material there
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>>8430900
http://4chan-science.wikia.com/wiki/Chemistry_Textbook_Recommendations

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Hey /sci/,
So I'm currently attending community college knocking out my gen-ed requirements for my associates degree in who-the-hell-knows.
I need to pick a major before I transfer.
>Modern medicine seems to attempt to make people as good, or as close to as good as they are naturally. (No leg? Give the man a plastic one.)
>High blood pressure? Let's lower that by introducing some mildly dangerous drugs into your system.
>OP wants to major in a field that will make people better than they were before. Something that would go along with transhumanist ideals, though perhaps in a way that's practical and actually applicable in the near future.
>Help OP decide what to major in.
Tl;dr: What field of study gives OP the greatest chance of being part of a transhumanist movement?
Pic not necessarily related
17 posts and 5 images submitted.
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>>8430814
Sounds like you want a bioengineering degree
Although you'll need more than a bachelors if you want to be doing actual creative research in the field
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>>8430827
This is OK. I love what I do at community college, and I think academia only gets better from here.
My concern with bioengineering was that I'd end up making pharmaceuticals-something I think will be seen as extremely primitive as other technologies advance.
What is the application of bioengineering now anon?
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>>8430829
>I think academia only gets better from there
Oh lad

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Does anyone have the full art of problem solving book collection + solution manual in pdf. Basically any links you have are appreciated.
Here is the full series: https://www.artofproblemsolving.com/store
12 posts and 1 images submitted.
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shameless bump
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>>8430771

Were you the same anon that made this same thread like a week or two ago?
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>>8430943
nope, you have a link?

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Is it possible to bend a sphere inside out without causing any sharp edges?
22 posts and 5 images submitted.
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>>8430585
Easy. Just work in a higher dimension.
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>>8430585
https://www.youtube.com/watch?v=R_w4HYXuo9M
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>>8430601
>you can't use a real sphere you have to use a made up bullshit fake math sphere instead

>>8430585
No.

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Thoughts on sheldrake's Dogs That Know Their Owners are Coming Home?
14 posts and 2 images submitted.
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>>8430549
Is there really a whole book on this, or is it a joke? Dogs have good hearing/other heightened senses. They wait at the door barking when they hear the car coming up to the house, it's not supernatural.
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>>8430586

>In 100 filmed tests, on average the dog spent far more time at the window when its owner was on her way home than when she was not.

>During the main period of her absence, before she started her return journey, the dog was at the window for an average of 24 seconds per 10-minute period (4% of the time), whereas when she was on her way home, during the first ten minutes of her homeward journey, from more than five miles away, the dog was at the window for an average of five minutes 30 seconds (55% of the time).

>Sheldrake interpreted the result as highly significant statistically.

The foremost researcher of the paranormal, everybody.
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>>8430549
wtf my doggo is an ayylien??
wtf ayyliens are doggos??

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This board likes to bash Computer Science. Yet there are some parts which are incredibly useful, such as computer vision or natural language processing.

By not a meme I mean:
1) Useful
2) Not self-evident
30 posts and 3 images submitted.
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>>8430496
machine learning
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Machine learning,data mining IMO. Stuff gets very complex very fast
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>>8430501
The great thing about machine learning is it keeps all the idiots out due to the math requirements.

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