Archived threads in /sci/ - Science & Math - 190. page

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What's the probability that the ? is a mine?

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1/13

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>>7727587

1/13

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Why?

What are the limits of human electrical sensitivity?

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975,000 Volts.

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>>7727571

Don't be a silly dill, 120 volts can kill

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>>7727574

Lel, pussy.

Anonymous

Combinatorics textbook 2015-12-17 20:06:27 Post No.7727514

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Combinatorics textbook 2015-12-17 20:06:27 Post No.7727514

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Recommend introductory combinatorics textbook for self-study (with full or partial solutions for odd-numbered exercises at least).

One of the aims (not general) is a better understanding of setting up unconditional probability problems.

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It's a big book. But it is like Steward for Combinatorics (perfect for beginners).

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>>7727557

>It's a big book

for you

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>>7727557

Thanks, man, but I have read Epp's Discrete Math. Now I'm reading Koh/Chen's "Principles and Techniques in Combinatorics" but it have a disorderly problem set without dividing on (sub)chapters and doesn't deal with some topics like Polya counting, etc.

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please help me sci not hmwk

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>>7727445

Nobody here has taken calc 2.

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>>7727445

Do you know how to use index notation, proving vector identities with tensors is a lot easier.

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>>7727445

OP here i'll post what I got to, I know the curl of the gradient of a scalar is 0 what next?

Is there a formula to solve this by hand, or do you actually need a graphing calculator for it?

My professor is insisting that a formula was given to us, but I can't find the damn thing in any of my notes.

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>>7727408

derive it. it's not hard.

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>>7727408

(1-(8/9)^16)/(1-8/9)

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Look up sums of geometric series. Really not that hard.

Is there anything particularly interesting about this graph?

Sum[n=1..infinity] (1/n)*sin(ithprime(n)*pi*x)

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Is there?

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Does it converge in some points at infinity? Is it possible to find a convergence domain?

Not that I could get anything out of it numbertheoretically speakig...

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>>7727576

What?

I have a question about prime numbers that might not have a proven answer, but here it goes.

I'm using the term 'gap' here loosely because I know 'primes gap' is a real term concerning the areas where we haven't established where primes may or may not be.

However, my question is, what is the largest 'gap' possible between every prime?

in other words, if gap = difference, the gap between primes A and B implies that in the range between those numbers there are no primes left, what is the maximum difference between A and...

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>>7727321

This gap you described has no bound, meaning that for every natural n there are two primes p,q with p-q>=n so that there is no prime number r with q<r<p.

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>>7727321

That literally is the definition of a prime gap, [math]g_n = p_{n+1}-p_n[/math]

That gap increases to infinity. That doesn't mean there's a finite amount of primes, it just means it gets arbitrarily large for high n. Interestingly there's times when there's a huge gap between primes and then there's a twin prime right next to it.

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Largefrac13fraclogXloglogXloglogloglogX(logloglogX)2

>4030/2

>still using MATLAB instead of Python

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>>7727220

>I compare a general purpose, slow to execute, fast to code, super high level language to a specific purpose, lower-level, matrix-computation optimized language unironically

kill yourself desu senpai

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>>7727226

Not OP, but it's well known that Python's array capabilities are only slightly slower than Matlab while Cython optimized array calculations (which most scientific distros of Python have built into the interpreter) are much faster than Matlab.

Also Python is faster to code in general.

I love MATLAB, but there is a good reason that Academia is jumping ship to Python.

Also we're all freetards by heart.

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>>7727220

>White space sensitive

Into the shitter it goes

Finals rage thread

>just took calc 2 final

>trying to prove convergence/divergence of a series

>try limit comparison test

>limit comes out to be 2/3

>my stupid fucking brain thought that the series converged if the limit > 1 instead of 0

> 2/3 < 1 so I'm like wtf it failed

>try regular comparison test

>obviously...

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Git gud, scrub.

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>>7727118

I am literally suicidal right now, please don't push me over the edge.

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Just got out of my calc III final

>optimization problem that was hard as fucking nails and math got ugly so gave up even though I was doing it right

>Used Stoke's theorem to find flux on a problem because I'm wee Todd Did

>Got two different answers on the other problem when I was just supposed to verify the answer

fug

So much for getting a B in calc III. You would never know I took calc III at another uni and got an A in it.

Man, fuck...

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why, in humans, are large butts and Lordosis Behaviour so arousing when these features aren't observed in other primates?

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What are you talking about if anything it's less pronounced

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>>7727097

chimps and gorillas don't do that though

fuck that baboon thing.

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>>7727086

Excessive lordosis isn't appealing though.

Why are cat ears attractive? Why do people want to fuck greys, if they're in the right mood? Humans will screw anything that fits a certain set of criteria. Humans will sexualize inanimate objects that have no discernible relation to the human form. Though those might act as fetishes.

It's a multifaceted deal.

Why is it called research?

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What the hell is happening to that coin?

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>>7727073

It's performing a magic trick

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>>7727073

it's photoshop

Are there any graduates students here?

The highest level of math everyone talks here is calculus or below, and scientific threads occur mainly on divulgation-level - yet, most people here spend a lot of time talking about how high their IQ is...

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What math do you want to talk about? I am free to talk about anything.

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>>7727062

Math grad student here. I only come to /sci/ for the IQ banter.

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>>7727063

Inter-universal TeichmÃ¼ller theory

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>ctrl+f

>no Materials or Nanotechnology thread

This should be rectified.

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>>7727048

ayyy materials and nanotubulars dude woahhh lmao

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Did you know that you can purify gold nanoparticles from the skin of a pomegranate?

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>>7727072

Sorry I should have said synthesize. Also you need Chloroauric acid.

"The Universe is shaped exactly like the Earth if you go straight along enough you'll end up where you were"

How true is this?

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we don't know but it seems likely to me that somehting like this might be true

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>>7726995

ill just leave this

https://www.youtube.com/watch?v=ycvlJ9XMd94

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>>7726995

I love Modest Mouse, although for me pic related is their best. I wonder what /sci/ listens to, anyway.

an update to a post from 5 days ago:

I asked this board whether it was possible to cram for Organic Chemistry in 2.5 days 9 (and pass with a decent grade) if I hadn't studied since the midterm and gotten 43% on that exam.

Most said it was impossible or that I might eke out a 50% if I was lucky

You're either all complete idiots or enjoy demotivating people because it's easy as fuck to learn how all the reactions and mechanisms work in two full days of study. Final was easy as fuck. 3 step synthesis problems easy as fuck

anyway good on...

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THAT PICTURE OF YOURS IS DEEPLY RACIST, ALL PEOPLES ARE EXACTLY THE SAME

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>>7726975

cool

i'll be saging your little ego jump

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>>7727003

;) no problemo friendo

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