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Archived threads in /sci/ - Science & Math - 1819. page

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whats the worst meme in science? ( spoiler alert: it's iq)
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Spotted the brainlet.
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>>7952399
>spoiler alert: it's iq
/thread
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Image quality is important because sometimes low resolution can blob things and give misinformation.

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Hey guys i'm starting to sign up for my summer classes and have the option to take differential equations before calc3 will I be ok or should I take calc3 before? They don't offer calc3 in summer that's why.
6 posts and 1 images submitted.
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You'll be fine. Diff eq for me was just an extension of calc ii. In fact, I dont think I applied anything from calc iii in diff eq.
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Look up how to do partial derivarives and you'll be fine.
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>>7952183
he won't need to. pdes is a seperate course. everything will pretty much be a function of one variable.

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I refer to proofs that are at most one page long, but are extremely clever.

The cleverest I've encountered is Kleene's recursion theorem.
7 posts and 1 images submitted.
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>>7952066
certainly the remarkable proof by the eminent Barnett that the sum of natural numbers is actually a negative one!
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Some simple classic proofs are ofcours the infinitute of primes and the irrationality of the sqaure root of 2.
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Best proofs are the ones that are frustratingly simple.

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How to get better at math proofs?
I've read several books about proofs, and I'm rather good at them, but I'm wondering whether I could become even better by committing some general rules and heuristics to memory.
I already know the different proof methods - I need to learn how to speed up the process and be more effective.

pic unrelated
9 posts and 3 images submitted.
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>>7951975
Your pic related is shit fyi.

If you're proving that two things are equal, then rely on the antisymmetry of an available order relation to get you through.
For example, to show that o(a)=n for an element of a group, say a, first show that o(a) <= n and then show o(a)>=n. Also, a much more common example is to show that two sets are equal by showing that they are mutual subsets.

If there is a statement about every element of an inductive set (not necessarily just the natural numbers,) then immediately try induction. If that doesn't work, then just see if you can prove it for a general element of the set.

If you're proving a bi conditional statement, say P<=>Q, I find it easier to prove P=>Q and ~P=>~Q in many cases instead of proving P=>Q and Q=>P. You're secretly proving the contrapositive of the converse of P=>Q when you do this.
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>>7952021
Thanks, this helped.
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>>7952021

>youre secretly proving the contrapositive
>secretly

op just follow an appropriately leveled textbook on a subject youre interested in learning and work through exercises and proofs given

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Any tips for studying and gettin work done? I don't believe you actually need to study 10 hours a day or something like that if you do it right. Tips for example to save time or to stay more focused.
6 posts and 1 images submitted.
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I'm a lot more focused at the library. I can't concentrate for shit at home or in cafés. Maybe make a study plan, give yourself breaks, reward yourself after you've finished something.
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adderal
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>>7951876
Em?

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Let's take you go and start swimming in pic related or go inside Chernobyl plant without a suit

how do you feel in the begining?
what do you feel? heat?
how long does it take until you pass out?
how is your death?
10 posts and 3 images submitted.
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uuo
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>>7951760

You could swim in that with no ill effects whatsoever unless you got close to the bottom.
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>>7951760
there would be no swimming in chernobyl, the core melted down and is a radioactive lump. You would taste metal, pass out, then the lining of your stomach would slough and your eyes would bleed. Eventually you would die.

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Well, /sci/ ?
8 posts and 1 images submitted.
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>>7951734
Try looking through your notes
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>>7951734
Ask Cleo.
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>it seems the answer is
Show your work then faggot

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I'm supposed to take this exam about 28 days from now. Problem is I'm only half way through this book.

Can anyone who's recently taken this tell me how tough this exam is? I'm only halfway through the review book and beginning to panic.

Background info: I got a BS in EE at the end of spring 2015.
9 posts and 1 images submitted.
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>>7951591
>>>/lgbt/
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>>7951591
It's been all this time and you still haven't taken the FE? Do you have job?
>>
>>7951591
its all junior/sophomore level shit. they straight up tell you what the breakout is in terms of number of questions for each topic.

EE has the worst pass rate for FE/PE exams though, good luck.

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I've worked with basic feed forward neural networks with backpropagation. But I'm having difficulty understanding convolutional neural networks.

I'd like to try making a small character recognition program.
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Here's a picture I was annoyed by the absence of when I read about the topic. The idea of a convolutional net is to have each neuron only look at the neurons spatially close to it in the layer above it, and for the neurons of each layer only to be of a small-ish number of types which share the same receiving parameters. I think other approaches are more popular for character image recognition now, but apparently you can make a mean go bot with them.
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>>7951793
That's not really how it works.

I'd check this out:
http://cs231n.github.io/convolutional-networks/
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>>7951866
Ignoring the boring stuff like sampling it says what I said. I pushed the neuron analogy a little further though. In its language each filter corresponds to a different kind of neuron in my language, and the connecting parameters for each kind of neuron corresponds to the matrix entries in the filter.

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>2016
What the fuck is wrong with all you educated dumb-asses. Why am I still a manlet? you niggers need to make me taller.
9 posts and 1 images submitted.
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this is a troll thread but people whow ant "cures" for being short are retards. It will make life worse for you. An easy simple cure comes out but it costs hundreds of thousands of dollars, now your shortness is looked down on as something you can change even though you are still unable to do it.
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>>7951452
>Richard Dawkins = 1.78 m
>being short are retards
I guess science has failed.
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>>7951418
Hi /fit/.
But really, out of curiosity, will we be able to change our height in the future or is breaking your legs for 50k the ultimate deal? I mean, us there some research on bones enlargment or in surgery techniques that would make it possible?

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Is this how a CRT TV really works or is the video fake?
https://www.youtube.com/watch?v=dnrQX0OmRio
7 posts and 1 images submitted.
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>>7951394
Not quite, what you can't see is that it's only rendering every other horizontal line on each vertical sweep. The fading afterglow is from the phosphorous screen.

Isn't this common knowledge or are you underage?
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>>7951417
>phosphorous

*phosphor
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>>7951394

ITT people who never took an analogic photo to an analogic screen.

Underage please [spoiler]learn[/spoiler].

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How does /sci/ feel about econometrics? Meme science or the most important practical application of mathematics in recent time?

I personally tend toward the latter but I'm not fully convinced.
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>>7951288
what does it do?
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>>7952491
You.
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>>7952491
It's just regression analysis with multiple independent variables. Ex: how much do race, age, and geography explain income?

Why dont function definitions such as f(x,y) = xy

use := instead
7 posts and 2 images submitted.
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It's often used in theorems or beginnings of proofs, not really much use using it all the time
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>>7951274
why would we want that?
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>>7951274
Because CS majors are faggots and "≝" and "≡" already exists

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Hey faggots, I started learning maths from the beginning a while back with the intention of learning calc. I'm not far away now. I can recall people on here saying that trig is one of the most important components and that is where people go wrong. I'm doing trig now, just learned the unit circle definition of trig ratios. What is it that I specifically need to pay attention to?


T-thanks.
8 posts and 1 images submitted.
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Come on you geniuses, help a brother out.
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>>7951233
>What is it that I specifically need to pay attention to?
Everything
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>>7951357

I am doing. But what is it specifically that stumps people?

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Too much fapping is causing me a lot of pain in my wrist and hand- particularly my index finger.

Do any of you nerds know of any good stretches or exercises to counteract the muscular imbalances caused by chronic masturbation?

pic unrelated
9 posts and 1 images submitted.
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>>7951178
Yeah, it's called exercising some willpower and turning off the naked Taiwanese cartoon ladies
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>>7951182

Even when I stop it still hurts a lot.

What muscle is used to grip the dick in your hand? That muscle in particular hurts like shit.
>>
your wrists must be shit if they get damaged from jacking off

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