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Archived threads in /sci/ - Science & Math - 75. page
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Is there any reason to pursue a career in academia? Why not just cash out by working for big oil, consultant or bank, for example? I get that its "noble" to pursue science just as a virtue, but is the trade off worth it?
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>>8466683
interest
>>
Why do Americans think about money all the time?
>>
>>8466683
Some people like doing theoretic work and academia is their best shot at getting paid for it.

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does trump winning mean more money for space?
for nasa?
for spacex?
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>>8464578
He's dumb and bragadoshious to spend money on a worthless project like that

So sure

He probably will
>>
>>8464578
If his tax plans go through americas federal budget will tank

So there will very likely be spending cuts to science
>>
>>8464587
>likely be spending cuts to science
can spacex likely survive without nasa aid?

if america drops the ball, who will lead into space? china or russia?

Show me how smart you are?
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17?
>>
>>8469996
Is that your final answer?
>>
>>8469993
fuck off

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of the 20th century and probably all time

agree or disagree
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yes

*waits for la Von Neumann meme
>>
>>8468312
isnt the greatest mathematician of all time that indian guy with lots of unpublished and lost papers?

raj something?
>>
>>8468319
Von Neumann was actually better

Is it an actual field of study, or merely philosophy in a cloak scientific jargon?
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>>
It used to be a respectable field. Now it's a meme degree for popsci fedoras who want to be Dick Dockins.
>>
It's a fucking mess now that genetical analysis has usurped physiology/anatomy in terms of species relation, but it's still applicable. We're still sorting out phylogenetic trees based on this shift but there are still many uses for evolutionary bio
>>
>>8466963
this is complete BS

Also, where the fuck can you even find degrees solely on evolutionary biology? Is this a US thing?

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I'm a CS student. In the beginning of the course, there wasn't much math, some teacher said that in practice they don't use math at all. Some said that in some specific areas like AI, more math was used. Great, I wanted to study AI anyway. So finally I began to study AI and was one of the biggest disappointments in my life. Some fields like metaheuristics have no cohesive theory at all. Worst: I almost don't see people putting effort to find one. No elegant universal analysis or mechanism. Very little math used. Most publications are in the style of "I...
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>>8468941
I'm assuming you're going to take the same sequence of calculus, multivariable calculus, differential equations, and linear algebra that every physical sciences and engineering student takes at decent schools.

Discrete math is likely the best place for you to start after this. Computational geometry would probably be useful too. Set theory, I believe, is also useful but I don't know how any of this relates to AI.

Keep in mind I did my degree in chemistry and don't know much about CS...
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I thank you for your reply, but that's the standart curriculum, and doesn't seem to help much to improve the deph of understanding of AI. Well, not alone.

In an analogy, it's like we have a lot of methods to solve some equations. But no theory of abstract algebra.
>>
Since this is the only thread about CS on /sci/:

Can someone explain to me how is AI, a fully logical mathematical system, even expected to happen when the logic behind the computer itself is flawed?

For an example, the Two's complement mechanic of the processors and the arbitrary way they're supposed to represent positive and negative values. They are not bound by mathematical logic but are rather abstract representations of bits (start with a "0" for positive and with a "1" for negative, when in reality no bit value can ever start with a zero since it is redundant, and such bit combinations do not exist in the real word).

How do you expect your hardware to work logically when at the literal lowest level you've used arbitrary abstraction that is only interpretable by humans? It's basically like saying "blue bits will now be negative, and red positive!". Or in other way, "it just werks so why bother change it lmao"

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what one are you? :S
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> engineering
i never tasted cum in my life and i never will
>>
>>8469817
>not tasting your own cum
>>
>sngineering
What do then mean by this?

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Can Yale be any bigger of a joke?
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>>8467457
My school did similar shit, but good god I didn't think anyone would cancel a fucking test.
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>>8467526
>My school did similar shit

What? I was a college freshman when Obama was elected president in 08 and we didn't do this shit.
>>
>>8467540
Except Obama is a liberal so it did not hurt the little kiddies' feewings.

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>tfw the clathrate gun has been fired this year
>it wasn't a meme
>it wasn't a jewish conspiracy
>it was fucking real and now we're going to pay

It's been nice knowing you, /sci/ ;_;
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>>8470877
well thats fucken disturbing

someone tell me its a hoax plz
>>
>>8470877
Well, fucked up as it is, at least sea ice melting doesn't raise sea levels. How's the land ice doing?

Also, link to the paper please.
>>
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Genuine question: How come we don't see the same pattern in the antarctic?

https://nsidc.org/data/seaice_index/

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That's it.
I've given up.
Dubs decides which A-levels I take. Give a reason for the one you choose
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>>8472324
Women's Studies.
>>
>>8472324
Nanotechnology. 'scool.
>>
General studies
Sociology
Theology
Maths + Further Maths

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Suppose you were tasked with allocating $100bn to scientific research projects (either existing or new projects). You can allocate as much or as little to each project as you want, but you must allocate all of the money. All of the projects must be genuine research efforts - no joke projects like building a cannon to shoot badgers into space or anything like that.

Which projects would you choose to allocate funds to, how much would each of those projects get, and why?

pic unrelated
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>>8472112
50 billion to prototyping O'Neil cylinder style colonies

30 billion split 3 ways towards basic research in physics, chemistry, and biology, with an allocation committee made up of respected scientists in each field.

20 billion to be allocated equally between fighting climate change and researching ways to convince people it is a real threat that must be acted on.
>>
Catgirl robot sex slaves. All of it
>>
$100bn to autism research. I want to get cured before I turn 21.

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>400 IPCC scenarios that keep warming under 2 C
>14% rely on emissions peaking in 2010
>86% rely on massive deployment of negative emissions technologies that do not exist and might never exist

Daily reminder that surviving your full natural lifespan is a literal science fiction story if you are anywhere near the center of 4chan's age distribution.
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>>8472041
>keep warming under 2 C
compared to the last ice age?
>>
>>8472041
how about you put a real candidate at the front of the Democratic party instead of a joke the caliber of Shitlary next time?

The multimillion companies behind her would probably have got their carbon footprints to shit countries should she had been elected anyway.
>>
>>8472186
I wasn't even a democrat before the election and I registered to vote Sanders so Clinton would lose. Dems are dead to me and I no longer believe a political solution is coming ever.

Second part of your post isn't intelligible.

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Why does comp sci make this board so butthurt? On no other website on the internet will you find as much ass-ravaging over the prospects of CS majors as you do here.

Can science explain this?
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>>8472004
lol idk they probably just can't program. seems to me there's just a whole lot of autism going on around here
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>>8472004
It's because CS is both interesting from a philosophical point of view and extremely useful and practical and often lucrative.

/sci/ only wants to talk about useless branches of abstract math and science that produce nonsensical or ambiguous results. [math]- \frac{1}{12}[/math], divide by zero, 0.999... etc.
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>>8472004
I don't think it's comp sci itself, it's because ppl feel like comp sci turns people into shills, although comp sci has plenty of theoretically interesting stuff

>>8472121
no

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This, as you would see if you knew romanian, is an exercise given at the math olympiad over here. As I am a really dumb student i can't figure out thos shitlove for the life of me. I am supposed to find out the limit of it and i was just wondering if any of you high gods of math have any idea. I know it is easy, it's for 11th grade, but looking back at it i realize i haven't really paid much attention back then. I praise thee high gods to glance over your loyal servant and cast your precious knowledge upon him.
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>>8471684
This shit for* even though i think that shitlove sounds way better
>>
ln(3)
>>
>>8471684
ln(3) is an upper bound

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I Have a rock. I don't know what it is of what it's worth. Help
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i like rocks
>>
>>8471245
molten plastic
>>
D-did you bedazzle a rock

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How can i create a function where f(x) = 1 if 0<x<1 otherwise f(x) = 0?
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>>
Sounds to me like you just did
>>
[math]
f(x) = \left\{\begin{matrix}
1, \: x\in (0,1) \\
0, \: x\notin (0,1) &
\end{matrix}\right.
[/math]
>>
[eqn]\begin{array}{cccl} f: & \mathbf R & \longrightarrow & \mathbf R \\ & x & \longmapsto & \begin{cases} 1 \quad \text{if } 0 \,<\, x \,<\, 1 \\ 0 \quad \text{otherwise} \end{cases} \end{array}[/eqn]

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GUYS I GOT IT

The universe is a just the big bang particle going through wave cycles. When we hit heat death, the wave function flattens, then the universe begins to head back towards a particle (the big crunch). Not really sure what happens for the second part, but it's a cycle.

So the universe is really just a particle this whole time just pretending to be in a bunch of other places, until some god-like being looks at us and then we have to assume a position or something I think.

OH SHIT IT GET'S WORSE

What if it's not gods that have...
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>Basically, once we figure out how and why the universe is supposed to work, it assumes a superposition, and we all die and the universe ends?

Wrong, obviously
>>
>>8470753
Obviously because god is real duh
>>
>>>/x/

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I'm fucking dying in Partial differential equations right now because, although I'm not a brainlet, I have a hard time with structured learning. What are some good extra study material/textbooks for Partial Differential Equations? I have a test coming up and I'm things are looking pretty bleak.
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Well I think Evans is the best book on the subject but requires a lot of time to go through
>>
cfish.xyz/cfish
>>
>>8470723
>tfw only had to learn ordinary linear DEs

I love not caring.

Hey /sci/, /k/ommando here, a buddy and I were out shooting and he asked if I knew what was inside of an electron, anyone know? Will we never know?
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>>
Magic
>>
>>8470662
gun freaks belong to >>>/k/ or >>>/pol/
>>
>>8470668
Kek

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Literally for what fucking purpose?

The ONLY time I've ever heard anyone talk about this obscure integral, is in the context of stochastic integration. Every fucking book I read on stochastic integration touches upon the Riemann-Stieltjes integral, highlights why it is useless in the context of probability, then moves on to the Itô integral.

Why would anyone ever use this thing?
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>>8470566
>to_what_import.bmp
you could at least give the definition. afair it's the integral rudin uses in his book

also from what I remember
>riemann integral
sum up rectangles under graph.
chop up domain (blue)

>lebesgue integral
same thing, but chop up codomain (red)

where does the riemann-stieltjes integral fit in between these two?
>>
>>8470623
Well to give you a tl;dr of the definition:

You have two functions [math]f [/math] and [math] \alpha [/math] from [math] \mathbb{R} \supseteq D \to \mathbb{R} [/math], then the Riemann-Stieltjes integral is defined as

[eqn] \int_A f \mathrm{d} \alpha = \sum_{j = 0}^{n} f(t_j) (\alpha(x_{j+1}) - \alpha(x_j)) [/eqn]

With each [math] t_j \in [x_j, x_{j+1}] [/math]. This is under the condition that [math] \alpha [/math] is of "bounded variation", meaning:

[eqn] \sum_{j = 0}^{n} (\alpha(x_{j+1})...
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>>8470566
https://en.wikipedia.org/wiki/Lebesgue%E2%80%93Stieltjes_integration
This shit is useful, Reiman version is a special case (pretty much). The reason you have seen it in stochastic calculus is because with it you can more or less introduce Ito integration without talking about measure theory.

>>8470623
Do you not have google? Either way it is the RIeman integral if you only have countable many discontinuities (defined in the obvious fashion).

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SHE'S GOT IT!
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>>8470383
Got what?
>>
>>8470385
It's a reference to a song from a lady's shaving commercial.
>>
Hope trump btfo's musk and announces we're colonizing Venus
Cloud cities here we come

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Primarily for the purpose of discussing chemistry, asking chemistry related questions and showing off chemistry related pictures, videos or academic accomplishments.
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>>
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>>8470245
shit, I wish I had anything to discuss, or ask... or show off atm
here, have an anime girl
>>
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>>8470254
>shit, I wish I had anything to discuss, or ask... or show off atm
h-haha
>>
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>>8470262
I dunno, I have written a paper on hydrolysis of ortho-alkylderivatives of aryl sulfochlorides
basically, frontal nucleophilic attack, provided sufficient water is present

disregard the disgusting visuale, pls

Can the electrical impulses of a brain be read, interpreted, "monitored", and/or influenced? Can information from the auditory/visual cortex be displayed on a monitor? If so, can it be done on a grand scale?

Asking because my paranoid schizophrenic friend is freaking me out. To the point where I want to know if it is or ever will be possible. I know it's outlandish and dumb as fuck but what isn't nowadays. I'm also asking from the standpoint of "will it ever be possible" more than "is it possible now".
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>>8469944
Eventually, absolutely.
http://www.sciencedirect.com/science/article/pii/S1053811913007994
http://science.sciencemag.org/content/early/2013/04/03/science.1234330
http://www.nature.com/nature/journal/v484/n7394/full/nature11028.html
>>
>>8469944
>read
yes
>interpreted
maybe
>influenced
Not in a non-invasive way. Yet. Mostly

>Can information from the auditory/visual cortex be displayed on a monitor
yes, but it might not be an image

>If so, can it be done on a grand scale?
yes, everything can be scaled up

btw all of these require huge amounts of equipment right next to...
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>>8469944
Yes and no. Mind reading technology is possible, with some constraints. You can infer the content of thoughts from measuring electrical shit in the brain. E.g. you can infer stuff like "this person is thinking about an elephant right now". However it remains at such an abstract level. The actual image of the elephant cannot be reconstructed, because qualia are fundamentally a quantum process and the collapse of quantum mechanical wave functions is uncontrollable.In particular you cannot enforce a very detailed...
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What is algebra, really?
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>>
sophisticated sandrunes
>>
Ive heard two definitions. probs wrong tho
1. equation solving
2.manipulation of symbols that represent numbers/variables
remember that Greek math had no idea of equations
>>
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>>8469628
>jelly

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Please help.

I'm not gonna make it am I?
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>>8469463
probably not, if you're scared of Calc III
>>
>>8469464
https://www.amazon.com/Theoretical-Physics-Dover-Books/dp/0486652270#reader_0486652270

pls help
>>
>>8469463
>>>/adv/
Ask your prof/TA?
If it's just for self-study hobby, just take your time.
If you're just here to brag you're doing Joos, I don't know what to say. Just sad.

How is Computer Science a legitimate field of science?
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>>
Only pure mathematics is a legitimate field of science.
>>
oh this thread again.

graduate level computer science is pretty legit

undergraduate level computer science is mostly preparing those for a career as a software developer

and yeah, basic algorithms, discrete math, linear algebra, etc... aren't necessarily difficult compared with some of the shit math / physics / engineering bros have to deal with, but they aren't easy either.
>>
>>8468779
dude logic lmao xD

prefacing this with a disclaimer that i do not come from a science/math background.

quantum mechanics are now present in a history of science class. while there will be in no way a testing of technical knowledge or application, i hate the feeling of sitting in lecture and not knowing whats going on beyond pictorial or illustrative examples.

im looking for some material that will teach me about it while hopefully introducing some of the mathematical concepts involved. i understand that me trying to understand this in this sense is like trying to speak a foreign...
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>>
it would be basically pure complex math from your point of view. of course you can just read/watch wrong simplified pop-scientific bullshit but you don't want that.

How far does your understanding of math and physics go?
>>
>>8468766

impoverished. classical mechanics, a rough understanding of relativity (spec/gen). mathematics even less so....

i feel like im in a terrible inbetween, not wanting to settle for the pop-sci stuff but also not trained to understand on a technical level.
>>
>>8468776
wait if you actually understand the theoretical physics of classical mechanics you can definitely look into quantum mechanics.
all you need is wave functions.

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>topology
can you PLEASE explain to me why this masturbation math exists?
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To give your stupid-ass [math]\lim_{x \,\rightarrow\, a} f \left( x \right)[/math] a meaning.
>>
>>8468683
What a fucking fag. Abstract topology is useful in robotics.
>>
>>8468691
the definition of a limit never needed homoemorphic dick sucking

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One of my tard classes caught up with me and now I have to spend an entire day writing an essay about racism or some shit. Why are general ed classes so fagged?
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>>
I'm general edding about history of energies and it's pretty based
>>
>>8468675
>hate thread
This doesn't belong on /sci/.
>>
>>8468680
Why? It's stem students fuming about non-stem classes. /sci/ is more about the lifestyle of scientists and mathematicians than actual math and science.

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How do I combat brain fog/ spaceyness? All this semester I've felt out of it and not all there, and keep overlooking and forgetting things and making dumb mistakes that I should know. Physically I feel slightly lightheaded and like I've taken a small hit of weed and had a drink or two, like I just woke up but all day long. Is this stress? Caffeine doesn't really help.z
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For how long do you use your computer for entertainment?
>>
Your youth is over, faggot. It all gets worse from here.
>>
>>8468471
Several hours. Is there a link?


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