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Archived threads in /sci/ - Science & Math - 223. page
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File: Lsidentity.png (63 KB, 354x148) Image search: [iqdb] [SauceNao] [Google]
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Okay, in my last thread I pretty much proved that none of you know the first thing about serious mathematics so this is a test.

/sci/ you have to proof the identity in pic related and if you are not then you are not fit for scientific discussion and therefore must go back to /b/ where you belong.

Can you do it?
Can even the collective effort of all /sci/ posters achieve it?

I FUCKING DOUBT IT.

But I will be happy to be proven wrong. You may ask me questions.

Some information about it:

As you can see, it is pretty much a better euler's...
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>>8214602
Cool hw thread OP.
Lemme know when you graduate crayons and move on to scissors
>>
>>8214628
I did not use crayons, those are markers.

Fuck you man, salty bitch because you can't deduce this revolutarionary theorem.
>>
>>8214628
By the way, I know how to prove it. I invented it. That is why I said that you could ask questions.

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Is there any mathematician that comes even close to master Gauss?
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>>
euler
>>
John God Neumann
>>
>>8212849
Galois. Too bad the fucker arranged a suicide by duel because boo hoo muh relationship. Teens.

Will fusion reactors save mankind?
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>>
>>8204254
I wouldn't go that far, but if we can get one to reliably put out more than what goes in then it will be a good replacement for dirtier or less renewable sources of cheap energy.
>>
>>8204254
Save mankind from what?
>>
>>8204254
is that radioactive?
i kinda want to live in that pic

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Any students living in Turkey here? Were your opportunities to become something significant just washed down the drain?
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>>8215724
not unless they say something about the great sultan erdogan

i have a bunch of turkish friends. they're currently split into the "erdogan is so great what is everybody whining about" and the "this was a staged coup and we're fucked now" camp.

erdogan pros:
- helped the lower class and working classes, at least tried to
- helped get broad education through the land
- publicly speaks out against things happening in gaza

erdogan cons:
- what is free speech?
-...
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>>
Umm no that's America
>>
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im applying for scholarship in germany
save me
>inb4 le german immigrant memes
i took german as my secondary foreign language, no other choice

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As a neuroscientist, should I even bother learning calculus? Or will all analysis and computation in my field be done by maths / comp people? I function well as a neuroscientist and I have though about taking calc courses, but would it give me anything right away or just the preliminary to study more?
56 replies and 5 images submitted. Click here to view.
>>
That's like asking if you should or should not go to the cinema because someone may at one point ask you about your opinion for the movie.
It's a fun thing to do and only takes a few hours off your time.
>>
>>8208836
You probably won't need it, but mitebfun
>>
>>8208836
I'm a neuroscientist also, And I'd recommend being familiar with calc for use in neural oscillator analysis. There are many algorithms that entail area under the curve, for instance, in psychophysics.

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Oh look, it's THIS thread again. But seriously now, what's the point of Mars colonization? Elon says: "It's for a human civilization back-up". We all know that Mars colony won't be self-sufficient in over 100 years and terraforming Mars will take thousands of years. It's a gigantic, ultraexpensive project. "But we can build mines on Mars and transport rare raw materials to Earth". Robot space mining costs billion dollars, but it's still millions times cheaper that building mines on Mars, and the whole process is much less complicated. Why he can't he focus first on space mining, which would make him a fucking first trillionare in a history, but he pushes SpaceX to create a Mars colony which is a strictly scientific, that means non-profitable, project. If he would make billions on raw materials from space first, then he could build his fucking colony not only on Mars.
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>>8199979
Because we need some fucking romance, something for daring adventurers to explore and inspire the rest of us back home.
>inb4 ocean
Ain't shit there and we all know it.
>>
>>8199979
>what's the point of Mars colonization

It is to show the horrific effects of macrogravity on humans over their lifetime. Can you imagine the Jello-kids that would be created if there was a legit colony on Mars? They'd never get enough gravity to form proper bones.
>>
>>8200002

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I just proved that modern mathematics is hugely flawed.

We pretty much have to go back a couple hundred years and go from there.

If you are not yet capable of understanding my complex proof then to sum it up I use the theory of infinite sums to prove that -1/12 = 0 = 1
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>>8214255
lul. Might want to make sure that 1+2+3+...= -1/12
>>
1+1+1 does not equal 2
i was expecting a good troll but u didnt even make it past the 3rd line
>>
>>8214266
didn't make it passed the 1st line

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How do I find out wether this is normal distribution (in excel) ?
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>>
>>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

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>biochemistry/biology/psychology/ neuroscience
>a science
>pick one

>only disciplines based in math, formal logic and subsequent proofs are sciences

>falsifiability is a meme; fuck Popper

>philosophy BTFO

Right, so falsifiability is a meme, only disciplines based in math, formal logic and subsequent proofs are sciences and philosophy can BTFO?

Well, if it’s...
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>>>/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

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When will brainlets finally realize that virsues 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.
56 replies and 15 images submitted. Click here to view.
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>>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.
>>
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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.

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chemistry isnt sciense
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>>
quality thread
>>
no it's art.
>>
>>8207689
no wonder jobs for chemists dont exist

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Why is lambda calculus so comfy bros
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>>
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.

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What's your favorite thing about set theory, /sci/?
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>>
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...
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>>8212036
Your mum is not flawed once I complete her with my dick, though.

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don't mean to be nudging /sci/'s gimmies and before you send me to /x/ realize that this is statistically impossible to be a chance occurrence.
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>>
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.

http://edition.cnn.com/2016/07/17/asia/china-migrant-worker-good-will-hunting/

>A Chinese migrant worker with no college degree has found a solution to a complex math problem -- in what appears to be a real life version of the Oscar-winning movie "Good Will Hunting."

>Yu Jianchun, who works for a parcel delivery company, said he'd always had a passion for numbers and has created an alternative method to verify Carmichael numbers.

>His solution amazed academics,...
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>>
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.

Where the fuck does the 1/2 come from in equation 11?

I used ax(bxc)=b(axc)-cx(axb) for the thingy with velocity and curl of velocity, so it shouldn't spit out any 1/2 factors
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>>
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

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What's the most helpful/life changing medical specialty?

I think it's Oncology
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>>
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

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Is it just me or has there been less development in physics during the last 50 years than the 50 years before that? If true why I'd this the case?
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>>
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.

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Hey /sci/, compsci undergrad here with a developing interest in physics. I've taken algebra-based physics 1 and 2, but I'd like to know more about the reasoning behind the shit they made us memorize. Any good textbooks with a calculus-based approach that also explains conceptually?
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>>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.

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I don't understand why red is false
12 replies and 1 images submitted. Click here to view.
>>
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}.

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if ketones can't be oxidized then why can we burn them?
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>>
>>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.

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Math is just a particularly consistent subset of natural language and there is no reason to believe aliens share it with us
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>>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...
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Hello Sci. I'm looking for someone to peer check my work. I am a researcher that is working on understanding leydig cell function.

Serum testosterone was measured in a group of male chimpanzees of varying ages by radioimmunoassay using a specific antiserum to testosterone-3-carboxym ethyloxime-bovine serum albumin. The juvenile age group, ranging from one through six years (n=26), had a mean serum testosterone value of 13ng/100ml (range 3.5-59ng/100ml). The adolescent age group, spanning years seven through ten (n=19), had a mean value of 178ng/100ml (range 14.6-238ng/100ml)....
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>>
>>8212494
Are you fucking serious? Go to a place that at least has a semblance of knowledge to get peer reviewed.

Coming to fucking /sci/ kek nice joke bra
>>
>>8212515
I was expecting a more.,mature response than that,here. . .
>>
>>8212523
that was a mistake

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When is it too late to get into mathematics and the sciences? I'm out of highschool (18, don't worry), and starting college in August. My strengths have always been History and English, and I'm a very strong writer. However, I'm very interested in the sciences, particularly biology, robotics, and space. I was never good at math in high school and I did decently in biology, chemistry, and physics. Is it too late for me to begin delving into the world of math & science? If not, where do I start?
15 replies and 1 images submitted. Click here to view.
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>>8212485
You should have been starting to get at least a basic understanding before high school
>>
>>8212485
>>8212502

Don't listen to this prick, do what makes you happy OP. If you enjoy the sciences go for it, you're still young. I learned those who love what they do easily surpass those who are only in it for the financial well being.
>>
>>8212485
It's never too late to learn anything OP. Try out Basic Mathematics by Serge Lang, I like his writing style.

Also refer to the /sci/ wikia.

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>>8212430
I know right

>mfw 95% of graduates can't even draw hands
>>
w-where is geology
>>
The fuck, why is biology and psych the only sciences up there?

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hey /sci/

I created a sort algorithm and am wondering if there are ways in math to prove if a specific algorithm is performed, that a list afterwards will have a specific property.

For my specific case let's say given a list (x_1, x_2,...,x_n) of un-ordered elements, I want to sort them into a new list of (y_1, y_2,...y_n) elements such that the new list has the property y_1 <= y_2 <= ... <= y_n.

The algorithm I used is this:
for (i=0;i<n-1;i++)
{
for (j=0;j<n-1;j++)
{
if (x_i <= x_i+1)
{
temporary = x_i
x_i...
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>>8212192
The usual trick is to generalize the hypothesis so that it gives you a correct statement about the list at every step of your algorithm. Then do induction over the steps in the algorithm.
>>
>>8212211
Or to be more specific to this case, the hypothesis should be something like "at step i, this part of the list is sorted."
>>
OP, what you "created" is known as the bubble sort algorithm and it's the most basic one there is.
Although I'm also curious about proving the correctness of this algorithm.
Have you considered using Hare's logic to do it?
The book "Systematic Programming: An Introduction" by Niklaus Wirth may help you with that.

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What do I about my horrible stomach problems? I have bad diarrhea and nausea all day, and it honestly severely worsens my depression. I figured since most of the threads here are garbage anyway I might as well see if any medfags can help. Pic unrelated.
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>>
>>8212079
If it only started today and you don't have a fever, then it will probably pass soon and you can only wait it out for now. Drink lots of water to stay hydrated, don't eat milk-products (encourage diarrhea) and try to stick to food that keeps your more constipated (bananas, bread, pasta, rice, etc.).

If you can recall anything bad you ate in the last 40 hours or so and may have caused this, you may want to dispose of any leftovers.
>>
You probably eat all the garbage in the middle of the supermarket. Stop eating anything but meat and vegetables you pleb.
>>
>>8212097
I've had this problem for like a year

Scientifically speaking, should gays be allowed to donate blood?

Would the extra supply of blood be worth the higher risk of STDs?
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>>
>>8211974
>2016
>not knowing that blood testing exists
>>
>>8211983
this
not allowing gays to donate blood because of >muh STDs implies they don't test their blood
untested hetero blood seems more concerning to me than certified clean niggerfaggot blood
>>
>>8211974
Receiving transfused blood when you have a circulatory collapse or are experiencing exsanguination is a life-saving treatment, as in

>If you don't get this treatment you will die from this condition 100%

AIDS has a survival rate of greater than 0% and although crippling and expensive, its better than being dead, no?

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I hate to make a thread but this is really really troubling me. I'm a Sophomore and I am meeting with the advisor tomorrow to choose my major. This whole time I have been doing CS/Math classes and I still just can't decide which to declare as my major.

I thought I knew but after months of reading CS hate here and the fact that I am extremely interested in crypto I am totally up in the air. I want to do a programming type job, but my personal interests are mostly the more mathematical side of things.

But I am extremely worried about if I get a Mathematics...
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>>
go into CS, you obviously like it better and liking math can help you be good with your CS degree.
don't let memes decide on what you wanna do for most of your life.
>>
>math PhD
>300k starting
>any job i want
>>
what is that stereogram, it doesnt look like shit

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What is the universe expanding into? What is on the other side of the expansion?
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>>
nothing, nothing
>>
The universe isn't expanding INTO anything, its infinite.

There isn't any other side.
>>
>>8211930
Wut


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