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Archived threads in /sci/ - Science & Math - 1599. page

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I wanted to have a discussion on the origin of gravity, what causes gravity firstly. I'm curious on the opinions of others

>Pic Unrelated
13 posts and 2 images submitted.
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>>8148894
[math]{R^\nabla }[/math]
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>>8148894
Mass. Anything else ?
>>
>>8148900
I think the question was misunderstood. I mean, what is gravity, is it Magnetic is it unknown what causes it?

>>8148906
So you believe it's the density of mass that causes gravity?

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What are the most reputable Pure Math schools? Pic related.
23 posts and 4 images submitted.
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>>8148878
ENS.
>>
Yourself and books.
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>>8148921
2nded

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When we say mathematics is rigorous, exactly what do we mean? Is it the fact that it is unambiguous? That we make a assumptions clear? But both those definitions are problematic, since I can easily keep asking for further assumptions, and anything can be classified as ambiguous if we pull if far enough.

I have no problem doing rigorous mathematics, I have problems seeing exactly what we mean by it. It doesn't seem to have a clear definition, or a clear way to measure or distinguish rigorous from non-rigorous.
16 posts and 3 images submitted.
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There are no assumptions.
>>
here's an attempt: rigorous = can straightforwardly be converted into a valid statement in formal logic

that's just the first thing to come to mind; go ahead and nitpick/criticize (for example: what counts as "straightforward"?)
>>
>>8149002

>wat is an axiom?

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What's the inverse of

[eqn]y=2^{2x}\cdot5^{2x+2}-10^{x+1}+1[/eqn]

?

>pic unrelated
12 posts and 1 images submitted.
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>>8148747
1/y=(1/22x⋅52x+2−10x+1+1)
You're welcome.
>>
>>8148756
By inverse I mean the inverse function, like turning [math]y=2x+3[/math] into [math]x=\frac{y-3}{2}[/math]
>>
>>8148747

x = log10((sqrt(y)+1)/5)

where log10 is the base 10 log.

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Hello /sci/, I'm a dummy and don't belong on this board but I think I just came up with a genius idea, what if the justice system were run by computer programs? My reasoning is that computers can't be bought or biased, mandatory and harsh sentences could be scaled I think. Good or bad idea? Has this been thought of before? I was even thinking of trying to writing a shitty story about it (don't steal if you think it would be a good one)
37 posts and 3 images submitted.
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>>8148740
You do not need a good program, just one that is better than the current system. Turns out computer are bad at making evaluations regarding people behaviour, so I will take a while, maybe forever, to make a good judge computer
>>
>>8148740
>genius idea
>using computer for everything
Yeah, truly breaking news.
>>
>>8148752
I only said that in contrast with calling myself a dummy anon

honestly I just wanted to see if you'd all debate the idea of it's coherent flaws and pluses

please weigh in

Found this cicada almost totally dead (it's legs were just barely moving) and it had these weird growths coming out of it. At first I thought that it was partially crushed and that they were some of it's guts but after picking it up I found that wasn't the case. Is it a parasite? That weird zombie fungus?
23 posts and 4 images submitted.
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>>8148700
>There are people crazy enough to touch bugs

Absolutely disgusting. I have never voluntarily touched a bug because bugs are horrible.
>>
Not exactly sure OP. You should try researching on what it is that you are speaking of.
>>
>>8148712
t. Entomologist

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I was wondering what the most optimal chemical competition for a bomb would be?
18 posts and 2 images submitted.
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>>8148697
TNT
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>>8148697
Probably steroids
>>
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>chemical bomb

the 1900s called

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>chest hurts, feel congested, cough, breathing issues
>pound a ton of caffeine and go for a walk
>no more hurt, can breathe

Somebody explain this. I swear it does the trick better than any medication. Is it just a placebo effect?
14 posts and 1 images submitted.
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>>8148506
Simply standing up takes care of a lot of aliments.
>>
>>8148506
Sounds placebo

If not go to a doc
>>
>>8148506
Explain your symptoms more. I have a BS in PhD MD

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I will study at M.I.T from now on. What should I except from this people ?
Also, I'm from Europe.
14 posts and 1 images submitted.
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Asians and elitists.
>>
me
>>
>>8148496
/thread

Say you released a golden retriever puppy into a pack of wolves. Would the puppy be able to integrate into the pack or had humanity too thoroughly genetically cucked the golden retrievers ability to survive in the wild?
19 posts and 2 images submitted.
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Domesticated dogs knew which animal was the greatest predator to follow. Wolves got cucked by nature and their shit judgment.
>>
>>8148492
Coyotes wind up raising stray pup dogs quite often, and occasionally the dog will even make alpha status. (A bit less common among wolves, obviously.)

Even when you get to the point where physical genetic alterations put them beyond all usefulness (Chihuahuas or what not) they seem to adapt fine. They don't become alphas, obviously, but the pack will still raise and defend them, at least some of the time.

Once in a great while, canines will even raise humans.
https://www.youtube.com/watch?v=UkX47t2QaRs

Packs choose pecking order based on physical strength, but it isn't, literally, a dog eat dog world. They tend to ensure that even the weakest among them will survive.
>>
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>>8148492
It could die of plain disease, parasites, cold, etc. Sometimes omega wolves are expelled from packs, become giant lone wolves otherwise they starve, and then make their own packs.. Epigenetics would play a big role here. The puppy could survive if females liked him and if the pack wasn't starving.

>>8148511
Great video.

Dear Anon, sorry for creating this stupid thread but I am in need of your help I want to study something technical but I don't really know what the smartest choice would be I really wanted to study economic computer science but I am afraid, that it will be worthless and I won't earn a lot of money, which to be honest is one of my goals later in life, I only know that I definitely want to study something technical, what would be the smartest choice?
33 posts and 1 images submitted.
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>>8148451
Engineering Physics
>>
>>8148460
Why?
>>
you should learn math and programming perfectly.

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How does she even pull of this kind of stuff so easily?

http://math.stackexchange.com/a/908325/290074
56 posts and 8 images submitted.
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>>8148427
it's a fucking bot
>>
>>8148427
Holy shit I love her
>>8148437
She can out-integrate Mathematica. Anyway why would anyone set up a bot to do this?
>>
>>8148442
to get dick picks by math professors and blackmail tenure out of them

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We can prove that for any finite group of order n, it must be true that the order of any of its elements divides n. However, does there always have to be an element of order d for all divisors d of n?

I tried proving this in general and for Abelian groups, but couldn't quite get there.
11 posts and 1 images submitted.
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>>8148416
Obviously not you cretin, that'd imply all groups are cyclic.
>>
>>8148416
the strongest result in this sense is Cauchy theorem
>>
The group [math] (\mathbb{Z}_2)^3 [\math] is an abelian group of order 8 with no elements of order higher than 2.

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I don't understand.. how can the SPHERE be the SHADOW?
11 posts and 5 images submitted.
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Like a rainbow man. The sphere is a shadow of particles. The thing just has the necessary ability to make its shadow curved and spherical due to the nature of how the particles reflec light.

You have to remember that AT fields exist there so there could be any number of surfaces for light to bounce off and form a sphere
>>
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>>8148345

leliel
>>
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>>8148345
It's a shitty anime from the 90s. Science isn't it's selling point.

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It's 2016
Why haven't we solved turbulence yet?
15 posts and 2 images submitted.
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>>8148206
Because it might not have closed form solutions.
>>
Turbulence is caused by wind, which is caused by tempurature changes in the weather, or by Induced Drag. All you can do to treat it is by being a good pilot and maneuvering through or around it.

Induced Drag is a natural byproduct from generating lift, and your pic related is whats called Wing Tip Vortexes. Theres minor things you can impliment onto the wing tips to help stop those WTVs but i think it is just natural. I'm interested in figuring out how to utilize WTVs for the plane.

One idea i have is setting up spinners that catch the air current and spin a crankshaft to charge or power sonething electrically. or even using it to stabilize the aircraft!
>>
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>>8148333
>Turbulence is caused by wind

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