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Archived threads in /sci/ - Science & Math - 625. page
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>"The authors showed in previous work that..."
>no citation where they showed it
>people who use [math]2^A[/math] instead of [math]\mathcal{P}(A)[/math]
>people who only use single letters to name functions and sets
98 replies and 10 images submitted. Click here to view.
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>>7652770
>>people who only use single letters to name functions and sets
Programmers gtfo.
>>
>people who use log instead of ln

Log will always be base 10 to me :3
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>>7652882
This so much

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Recently voted the most influential book of all time. Do you agree?
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>>7659872
>what is the bible
Shit is the only reason the average person knows how to read
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>>7659878
>the only reason the average person knows how to read

[citation needed]
>>
>implying it's more influential by the bible
Atheists are the delusional ones desu

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Why does having relatively high intelligence and problem solving skills tend to cause other mental issues such as depression?

Will the mystery ever be solved?
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>>7659694
Because you're pushing the limits of what humanity can do. You're thinking about abstract concepts and forcing your body to answer questions more complex than. How to avoid bear? How to get food? How to fuck her? etc. The latter is your natural desire.

Sometimes brilliant people break down and just retreat to the wilderness as primitives because they crack.
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>>7659694
I doubt it's something you'll have to worry about.
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>>7659711
I don't claim to be super intelligent or anything, I'm still above the average person in terms of problem solving skills however, granted that's probably a part of the whole autism thing

Apparently according to new research autism was a trait that was useful in hunter gatherer tribes where there was less social interaction to be had and the enhanced reasoning skills it tends to give let it survive though generations, or something like that

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STEM majors, would you work for a defense contractor? why or why not.
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>>7657498
>why not
Exactly.
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>>7657498
>would you work for a defense contractor?

Yep

>Why?

Because humans have been killing each other since time immemorial, if I didn't work that job someone else would and if no one worked that job then we'd just go back to killing each other with large bits of rock and pointy sticks.
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>>7657498
Yes
>Good pay
>Looks good on resume
>I have no morals

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what's the future going to be like?
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>>7656863
The human race being just as shit as it always was in new ways, and maybe new places.

It'd be good for the universe if we never managed to leave Earth. We're going to spread like a disease.
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>>7656863
Three primary possibilities:

1.Humans remain on earth. Humans continue being humans. Theres pain, war, struggle, despite some things being improved. Everyone keeps on getting by, particularly poor places get richer, etc.

2. Humans leave earth. Basically precisely above except we also have people on other planets. Cool!

3.Industrial society collapses and we go back to preindustrial living. Humans continue being humans just as they did for thousands of years.

>>7656866
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>>7656869
Not evil, intrinsically broken. We aren't able to be or create anything we don't hate on some level. This is potentiated by existing in a group.

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ITT: Things you do to annoy/troll undergraduates
1) Pronounce Galois Gaylouis
2) Insist that you can use prove the chain rule with cancelation of fractions
3) Handwave hard proofs, go through easy proofs with infuriating detail
126 replies and 5 images submitted. Click here to view.
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>>7656787
Satan? Is that you?
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>>7656787
>[Any question about fundamentals that would take me less than a minute to review]
>Recall from [exact subsection/equation reference to a textbook in another course that they used 2 years ago].
I love watching them freeze up and error while considering that I'm expecting them to remember everything they learned in precise detail. The smart ones start panicking and reviewing, the rest just get depressed.
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>>7656787
>Hand wave hard proofs, go through easy proofs with infuriating detail.

Guilty as charged :^)

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How do I determine if an intersection between two geometric objects exist?
255 replies and 41 images submitted. Click here to view.
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>>7654887
What on this green earth is happening in your pic?

are they convex? Then use separating axis theorem. If you are trying to make your own collision detection system, just use bullet.
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>>7654894
for all shapes

I'm looking for a general solution
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>>7654910
You can't detect collision for real, any-shape because you can't represent it in computer memory. You need to simplify it first.
Do you want shape based on triangles or voxels or mathematical perfect primitive shapes like spheres or cylinders? 2D or 3D or higher dimensions?

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Who /failingcalculus/ here

Derivatives some wack shit man
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I've TA'ed calculus and a bunch of people failed if that counts. Derivatives are some wack shit, but I think what holds most people back is the algebra rather than the concepts and the formulas.
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>>7653079
This to be honest family, more so when integrating, algebraing the fuck out of functions to fit the formulas is the hard part, mostly because relies on mathematical intuition and algebraic experience more than actual knowledge of what your Calculus book says.
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>>7653072
>Derivatives some wack shit man
You better get the fuck out of here with that weak shit.

Deriviatives are literally the easiest part of calculus. The operators take two seconds to complete, and the chain rule is only mildly complex.

Calculus is the shit son. You better read the Principia and realize how much of an ingrate you are.

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STEM doesn't exist anymore, it wasn't progressive enough.
It's STEAM now, shitlords. Like the site you use to buy videogames on pc.
Women felt excluded so we had to add the A, which stands for "Art".
Look at the cool shit modern artists can do, they are of prime importance to our society

http://stemtosteam.org/
http://steam-notstem.com/
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>>7652691
>Art
>Discover
>Understand
>Design

Kek.
>>
Why women?

At least STEAM rhymes with meme.
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>>7652707
>At least STEAM rhymes with meme.
what

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Physics people. Let's assume that we live in a closed universe (in which you travel far enough in any direction and end up back where you started). Picture two observers Alice and Bob, both in inertial reference frames and traveling past each other, each measuring the other's velocity to be close to c (and theirs to be 0, obviously) as depicted. On one particular 'pass', when they're both next to each other, they synchronise their clocks and continue on their way. The next time they meet each other, both will claim that more time has elapsed on their...
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>>7652676
>synchronise their clocks

whooops
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>>7652676
Think about this.

How do they synchronize their clocks?

What is the physical method of determining synchronisity?
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>>7652676
those names seem familiar

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Is there an actual formula for finding Sin, Cos, Tan, etc.?
If not, then how do calculators find it?
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I don't understand what you're saying.
>>
Calculators take a taylor series approximation that's good enough for anything.
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>>7650963
[math]tan(x)=sin(x)/cos(x)[/math]
[math]cos(x)=sin(x)*tan(x)[/math]
[math]sin(x)=cos(x)*tan(x)[/math]
:^)

Why are women attractive? And don't say evolution.

Why don't we know why sexual reproduction exists?
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>>7650411
Because if we had no attraction we wouldn't really care about reproducing. Attraction brings competitiveness which brings survival of the fittest.
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>>7650545
>Why are women attractive?
Scent, associative factors, and tendencies of the brain when processing shapes and conceptualizing. Why does some food taste good and others not? It's of the same basis.

The only odd part is how these mate selection heuristics come into play to begin with. Some of it can be explained, others are a bit harder. Like choosing women that aren't just genetically fit, but have behaviors suggesting they'll be viable partners to work with and...
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>>7650545

better question, why are some women NOT attractive.

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Why haven't we found life on other planets yet? I've read the counter to this is that, "it's highly probable that life is extremely rare", this being a plausible explanation because, well, we haven't found unarguable proof of life existing outside of Earth.

To piggyback on the above, how about the current explanation for how non life turned into life? If the explanation for how life evolved from non life was that at a certain point in time, Earth had precisely the right set of circumstances for non life to turn into life, what about other extremely Earth like planets such a Kepler? Wouldn't one of these planets have some detectable form of life with all the tools we have to monitor such things these days? Wouldn't one of the other extremely Earth like planets {that we're currently aware of} have signs of life?

It just doesn't make sense. There are more habitable planets than Earth that surely would have had to have gone through the exact same processes as Earth to have nurtured non life into life, surely one of these planets would not only have a currently detectable life form but even have produced a more complex, more advanced or more intelligent form? But all we have is life on Earth and some wingnut claiming they can demonstrate what they believe to be the building block of life somewhere else without any objectively proof.

tldr How do you explain life likely not existing on the Earth like planets given our best explanation for non life turning into life?
144 replies and 20 images submitted. Click here to view.
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Let's just name all those space probes we sent out to explicitely analyise other planets and moons for forms of life.

Uuhhhh.
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>>7649030
to counter this, if non life can produce life then surely one of the other earth like planets would have evolved an intelligent form of life capable of receiving our communication signals. the way a habitable planet forms isn't unique to earth and thus there must be billions of earth like planets out there -- and none of them can communicate with us.
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>>7649019
>hen surely one of the other earth like planets would have evolved an intelligent form of life capable of receiving our communication signals.

It only has been very recently that we were able to detect other planets at all, nevermind those with actual possible living conditions. Then there is the thing that just because a planet can sustain life, it doesn't mean it can sustain very complex life. And thirdly, even if has been listening to all those different exoplanets for the...
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What is the cause of depression?
151 replies and 32 images submitted. Click here to view.
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lack of a sex life
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>>7648230
Owning a mirror
>>
Can either be strictly psychological, strictly physiological, or both.

I'd wager it's usually a bit of both. Antidepressants should be an absolute last resort, but unfortunately GPs (and to a lesser extent, psychiatrists) give em out like candy. Further solidifying their place in our great "if X then Y" culture.

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I'm currently studying maths (integrated Masters) at a pretty solid UK uni, I'm only a first year, but I want to get a PhD and then get into research.

Is there anything I should know? Or any Maths PhDs on /sci/? It'd be interesting to start a discussion about how it is and where you're working now. Are you in research?

Actually, how hard is it to get a in research once you've got your PhD?
118 replies and 11 images submitted. Click here to view.
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> how hard is it to get a in research once you've got your PhD?
It's trivial. You've already been collaborating with some people in your field by then, and the whole point of doing a PhD is to prepare you to do research independently. You'll have friends in your field or similar enough fields, you'll be invited to conferences to meet people, and so on.

Most people carry on with some aspect of their PhD work that they didn't get to do while they were finishing their thesis. Typically, you'll have a dozen...
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>>7637688
>It's very hard to get a get a full time, tenure-track job these days
>and develop strong feelings of bitterness about the whole broken system.
Isn't that more of an American issue?
>>
Why is everyone in a Math PhD autistic?

>undergrad in math grad class
>doing homework
>submit correct proof
>grader is a PhD student
>get points off for referencing a theorem in our textbook instead of proving the case yourself
>get points off for assuming things proven in undergrad analysis instead of proving them all over again

At this point I'm going to get a B...
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