Archived threads in /sci/ - Science & Math - 1527. page

>>8195990
Take mean, median and mode. Are they all the same? Its normal because central limit theorem.
Chi-square goodness-of-fit test to see if it's a normal distribution.
Whatever other unneccessary tests you wanna try.

Compute

m := E[x]
v := E[(m-x)^2]

and plot

C · exp(-(m-x)^2/2v)

for the C that makes the quadratic error the smallest and you got yourself a Gaussian fit

https://en.wikipedia.org/wiki/Normality_test

but to be real for a second: normality tests are almost entirely useless. any real-world situation where you might want to perform a normality test, you're either going to find that it's definitely not normal (which is probably an obvious result) or that it's close enough to normal that no one will ever give a shit if you just assume normality

>>>/lit/
>>>/x/
fuck off philosotard

>>8212127

Math is a member of the philosophy set: M ∈ P

If something is falsifiable then it is scientific: F ⊃ S

If something is not falsifiable then it is unscientific: ~ F ⊃ ~S

If something is mathematical and falsifiable then it is scientific: (M · F) ⊃ S

If something is mathematical but unfalsifiable then it is unscientific: (M · ~F) ⊃ ~S

>>8212138
The perfect summary

>>8211799
I agree with you man. We need to save its kind before man makes them extinct!

Yep, viruses play an important role in evolution. The dna they inject sometimes gets passed on, and thus viruses accelerate mutation. In modern medicine designer viruses are being tested as a way to do gene therapy. In the near future lots of genetic ailments like diabetes will be cured with viruses.

File: molocule4.jpg (17KB, 300x358px) Image search: [Google]

17KB, 300x358px

When will brainlets finally realize that hydrogen atoms have been directly and indirectly involved in the creation of life as we know it and that without them life in the current form would be impossible?

Pic related, a majestic divine creature you should start praying to every day, brainlets.

quality thread

File: if-jesse-pinkman-quotes-from-breaking-bad-were-mo-2-1714-1421076367-27_dblbig[1].jpg (39KB, 625x415px) Image search: [Google]

39KB, 625x415px

no it's art.

>>8207689
no wonder jobs for chemists dont exist

looks stupid
like set theory

>>8206211
>look mom i'm doing it again

It gives a intuitive perspective for dealing with intuitionistic logic. It shows the Curry Howard correspondence between proof theory and computability (proofs = programs). It's a great place to start with the whole
Logic ~ Type Theory ~ Category Theory
perspective on programming and theorem proving.

>>8206211
Set theory doesn't have shit on type theory.

boolean algebra

>>8212020
I stopped caring about math when I was introduced to the concept of infinite sets. What a crock of shit. If your system can only be axiomatized by inventing sets that can't exist, like some kind of math deity , then you are fucking wrong and the math is flawed. Same for nonconstructive proofs that basically say "the correct answer is whatever the correct answer is". Thats what the math said transcribed to words but god forbid if i wrote in down in english instead of the ancient math runes the teacher word mark me wrong.

Math is logical and numbers never lie my ass. Math is just as flawed as any other human construct.

>>8212036
Your mum is not flawed once I complete her with my dick, though.

it's also a phone number. you should call it, it's a sign.

>>8211719
Because the last digits are added to add significance. This isn't that impressive. It also makes the assumption that egyptions used meters and a unit of seconds equal to the current one which is incredilby unlikely.

>>8211719
Rarely is anything statistically impossible. Plot twist, this isn't statistically impossible.

Gonna laugh if some peasant living in China breaks RSA.

>However, at age 33 and still single, he says his primary concern is to get married.

Smart people in America avoid starting a family like it's the plague. Smart people in China make it their life goal.

>>8214112
ofc he did it, why do you assume that he didn't? The only thing bothers me about this headline is the word "migrant". No. He's not. He's Chinese, living in China. I couldn't give a single fuck that he traveled 2000 kms inside China to get a living, plastering it with the word "migrant" is just another try from the western media to get clicks on facebook. Fucking annoying.

dont know so heres a bump
also when do u use equivalent instead of equals

>>8213844
I treat it more like a stylistic difference, or when distinguishing between stating an equation and stating something being the same as something else (equivalent, if you like)

also bump

>>8213832
you have to take the gradient of that expression which is kinda its derivative if you think about it (the first term from the left in eq 9, there you have a vectorial derivative which is equivalent with taking the gradient of the square of v )
so when you differentiate v^2 you would get 2v but that's a no-no as you only need v so that 1/2 comes in and saves the day

Depends on whether you treat patients one by one, or whether you are actually researching a cure.

Treating patients one by one is not helpful in the large scale of things.

>>8212894
>Treating patients one by one is not helpful in the large scale of things.
And yet it has to be done.

>>8212894
Not finding jackshit after billions of dollars isn't gonna be that helpful either

itisjustu >>8212759

Its not true of course. Your popsci magazines are just too slow to catch up on things.

>>8212759
it's quite the opposite, my friend.

>>8212748
for college freshman (calc. based) intro physics, get halliday/resnick
http://bookzz.org/book/507433/a4b121

if you want a good treatment:
goldstein 'classical mechanics'
http://bookzz.org/book/450084/e1b1c2

you may want to ease into goldstein with taylor
http://bookzz.org/book/1024037/ff3619

put on your big boy pants (some years from now)
http://bookzz.org/book/451142/19bb52

>>8212748
>I've taken algebra-based physics 1 and 2

Why did you waste your time and not take the calculus based version?

>>8212761
Thanks! I'll definitely check these out.

>>8212772
I had a few issues with prerequisites—one of them being calculus 1, which I didn't have when I took it my freshman year.

Because green is true. green excludes red.

>>8212660
You could ask yourself: can a set contain itself?

Elements aren't defined by a set containing only themselves. A set can contain sets. A set can contain colors or flavors of laffy taffy. A color isn't a set that contains itself.

Saying 'by definition' about something you don't understand doesn't make it true. In reality, real numbers are often constructed via sets and relations on these sets--however, they are not just a single set with a lone element plucked out.

>>8212660
Maybe just because A = {A} isn't explicitly defined. Because {A} is a proper subset of {A,B,C}.

>>8212616
>if ketones can't be oxidized
they can be
mCBPA takes ketones to esters
https://en.wikipedia.org/wiki/Baeyer%E2%80%93Villiger_oxidation

burning them in XS oxygen (under the right conditions, blah blah) will take all organic C, including the carbonyl, to CO2

chemistry isnt sciense

Type one diabetic here. Ketones are the result of fat the body stores for energy when the body can't process carbs due to either lack of insulin, or, the body killing it's insulin processing cells.

>>8212583
the natural numbers - the basis of our mathematics - have very good properties of "unicity" through logical systems

if their logic is anything like ours, their math is, too.

>>8212583
I sympathize, but if this is the case, how do you account for the mathematics employed (unknowingly) by other species on this planet?
Just one example
https://en.wikipedia.org/wiki/Periodical_cicadas#Evolution
If math is just a very consistent language, what it describes are patterns, and while aliems might see other patterns and describe them differently, there is a universality to certain patterns we see, and we should expect aliems to notice and express at least some of the ones we do.

>>8212587
If you believe god made the naturals sure, but what about the integers?
the rationals?
the reals?
I can believe some space faring intelligences don't have the same concept of real numbers or connected topological spaces or what have you as we do.

>>8212591
How do you distinguish the description of the pattern from the pattern without langauge. Do you think it is possible to understand an alien's math without its langauge?

Also I'm a little drunk and don't go here much do to rampant baiting but just realized this is a shitty topic for /sci/ since it is pretty much entirely philosophy