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Archived threads in /sci/ - Science & Math - 278. page
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File: chess.jpg (38 KB, 476x464) Image search: [iqdb] [SauceNao] [Google]
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White to move, who is favoured /sci//?
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>>7654806
queen on d7 then either advance the pawn or get rid of the knight depending on what black does
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black because i just reported you
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>>7654815
to the chess.com staff that is

File: neta-alchamister.jpg (102 KB, 640x640) Image search: [iqdb] [SauceNao] [Google]
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How do you explain the fact that out of endless possibilities of combinations of arbitrary parameters all of which would lead to nothing in particular, the specific combination of arbitrary parameters that constitute our physical world led to us and all this?
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>>7654778
In whatever kind of wasteland exists outside of our universe, there are no physical laws (e.g. of conservation of mass/energy) to bar universes like ours from popping into existence. Of these universes, only the ones which are stable survive, and of these stable universes, only the ones that can support complex intelligent life give rise to the question of their own existence.
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>>7654918

>le fancy re-statement of le weak anthropic principle xD

The first sentence is a novel addition however.
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>>7654778
Because if it didn't, we wouldn't be here to talk about it. If we're here, it had to be this "combination"

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Can someone explain to me what genetics tell us about Europeans and especially Germanic people? I'm not a stormfag by the way
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That they are a unique genetic clustering that should be preserved and protected rather than thrown onto the alter of globalism to satisfy some transient neo-Marxist political wetdream.
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It tells us Indo-european speakers came to Europe from the mountains of the middle east as picrelated is the distribution of the R1b which is ancestral to all western European R1b.
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>>7654782
Is there anything mentionable about people with green eyes? ie, people from around the eurasian mountainous area?

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>>
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>>7654690
You can't represent the whole of Japanese art with the Edo period alone. Least that's probably when it's from without bothering to look it up.
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>>7654690
>The Japanese guy has an X-Men badge.
>He is a mutant.
>That is actually how he looked in real life.

File: AjDKv8Q.png (362 KB, 1022x581) Image search: [iqdb] [SauceNao] [Google]
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Why can't kekstructivists construct the largest prime number?
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>>7654422
holy fuck did it change my kek to kek??
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>>7654424
wordfilters, faggot. now get where you belong:
>>>/trash/
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>>7654422
>>7654424
>look mom I'm still doing it!

jesus

File: humansnake.jpg (280 KB, 1128x712) Image search: [iqdb] [SauceNao] [Google]
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I've got a question for all you biologists out there. So I had a little thought experiment about the combination of species, namely humans and snakes.

So here's the question.
This supposed combination species of human and snake, in your opinion would it give birth, or lay eggs?
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>>>/d/
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The lamia from FFXI were magical experiments and did not in fact have the ability to reproduce.

Neither
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>>7654325
I think it will be giving birth, why? idk I can say anything, maybe because, if that happen, the "living thing" will be big, and is often seen that great species don't lay eggs

File: FockingFormulas.png (12 KB, 433x154) Image search: [iqdb] [SauceNao] [Google]
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Howdy /sci/, first time poster

Working on something for work (in my own time as a bit of a project) and I'm stuck with an equation I need to reverse for working out wages.

The formulas we're provided with will calculate tax on a gross amount, which is withheld and the employees get paid the net amount after tax. I want to work it backwards.

We're given the following formula

>y=ax-b
>Where y=tax
>a=gross
>x= Coefficient x
>b= Coefficient b
>n= net

I'm bloody hopeless at math and even worse with algebra so the closest I've come is

>n=g-(gx-b)

But stuffed if I know how to solve it.

Pic is my silly table.
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Bump
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>>7654230
Question is not clear. You're given
Gross = Net - Tax
Tax = Gross * X - B

And you want to solve for what as a function of what?
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File: aXcoQAe.jpg (3 MB, 2448x1648) Image search: [iqdb] [SauceNao] [Google]
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>>7654253

In a real situation, we are only given the Net amount.

Given that I know what X and B are for that particular figure, I want to be able to figure out the tax on Net.

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What happens when we run out of oil?
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>>7654191
Trump makes Mexico buy us more.
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>>7654191
WW3
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Social and economic chaos will ensure

We're too heavily dependent on it that a switch to alternative sources for fuel will take decades to happen

Hi,

I was hoping someone could explain an idea I heard of before but never fully formalized. Basically, it was a philosophy for why the error terms in prime counting functions (in number fields, function fields, and some other places in number theory) "should" have exponent 1/2, (almost) as predicted by the Riemann hypothesis and its variants.

Here's a vague idea of what I have, if it helps prompt someone to properly explain/give a reference. The keyword is the Central Limit Theorem, which states (I believe...) that if $X_i$ are a collection...
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>>7654155
Let me try CLT again:
[eqn] \frac{X_1 + ... + X_n}{\sqrt{n}} \to N(0,\sigma).[/eqn]
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>>7654155
Just for completeness, in case a statistician shows up that is unfamiliar with the number theory: the Mobius function $\mu(n)$ takes value either $-1, 0, 1$ depending on the prime factors of n so that it is 0 when n is divisible by a square, -1 when divisible by an odd number of distinct primes, and 1 otherwise. So if there's no bias in number to have even or odd prime number of divisors, the mean of $\mu(n) = \lim_{x \to \infty} \frac{1}{x} \sum_{n \le x} \mu(n)$ should be 0,...
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>>7654167
One more post, sorry.

It is a theorem (equivalent to the famous Prime Number Theorem!) that
[eqn] M(\mu) = \lim_{x \to \infty} \frac{1}{x} \sum_{n \le x} \mu(n) = 0[/eqn]
and the Riemann hypothesis is that we have the estimate
[eqn] \frac{1}{x} \sum_{n \le x} \mu(n) = O(x^{1/2+\varepsilon}).[/eqn]
That should make more sense.

File: college.jpg (167 KB, 900x695) Image search: [iqdb] [SauceNao] [Google]
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I have two months until university starts. How do I learn the harder algebra and pre-calculus so that I can test into Calculus?

What books, to be specific? I have a \$110 card to Half Price Books and need to spend it anyway as there is no HPB where my university is and it will be worthless once I go.
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>harder algebra
>pre-calculus
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>>7654104
Just stare at a unit circle for 2 months straight, thats how I did it.
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if ur any good the test should be ez

File: smelt-01.jpg (64 KB, 800x533) Image search: [iqdb] [SauceNao] [Google]
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Gallium metal has a melting point of about 30 degrees C.
Galinstan metal has a melting point of about -19 degrees C.
If I melted these two metals and mixed them, would they bond into a metal with the melting point of about 5.5 degrees C?

I mean just by allowing them to melt and mixing them in a container. And not adding any extra heat above 30 degrees.
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>>7653921
It can have different melting points depending on how the crystal structure of the alloy is.
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>>7653921
Silly you, Galinstan is an alloy of Gallium and some other stuff.

Enough endless bickering and let's compile a list of good calculus books at various levels to point people to.
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>>7653912
>>Single Variable Calculus
>Weak Students
"Calculus Made Easy" by Silvanus Thompson and Martin Gardner
"Calculus: An Intuitive and Physical Approach" (Dover) by Morris Kline
"Elementary Calculus: An Infinitesimal Approach" by Jerome Keisler (Uses infinitesimals)
"A First Course in Calculus" by Serge Lang

>Strong Students
"Calculus" by Spivak (Good mathematical...
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>>7653917
Is infinitesimals good or bad? What are the benefits/ disadvantages? I've only taken 1 semester of calc back in high school (dropped cause I did poorly.)
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>>7653917
>>Analysis
>Single Variable (with Metric Spaces)
"Real Mathematical Analysis" by Pugh (weaker version of Rudin)
"Principles of Mathematical Analysis" by Rudin
"Mathematical Analysis" by Apostol
"Mathematical Analysis I & II" by Zorich

>Multivariable Analysis
"Functions of Several Variables" by Fleming
"Analysis on Manifolds" by Munkres
"Calculus...

File: 140110_marijuana_ap_605.jpg (119 KB, 605x328) Image search: [iqdb] [SauceNao] [Google]
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On a scale from 1 to 10, how much does weed cure cancer?
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it doesn't cure cancer you dumbfuck it just alleviates some of the pain caused by cancer symptoms.
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>>7653905
Look up some of the literature on the cannabinoid system's relationship with immune system modulation.
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>>7653901
>>7653901
4.20 bruh

File: consciousness-grid.jpg (76 KB, 400x233) Image search: [iqdb] [SauceNao] [Google]
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Ideas, experiences, questions, knowledge, etc?
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Coming from the round earther
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Use complete sentences and maybe I'll give you an actual reply.
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>>7653890
https://en.wikipedia.org/wiki/Collective_unconscious

File: VWdL0je.png (623 KB, 720x702) Image search: [iqdb] [SauceNao] [Google]
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Hey /sci
I fucked up
I'm pretty good at learning things
I am number one in my Math and Physics class almost number one in History
I just started to get my shit together
But I ran into a problem In engineering class. I haven't paid attention until now and there is no textbook for this shit

I'm looking for any anons who know anything about breadboards, "and gates", "Or gates", "Inverter gates", Multisim, "oscillator".....(Multisim...
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>I'm pretty good at learning things

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>>7653886

Grades don't matter. Sorry to burst your bubble. What matters is that you learn problem solving skills. Trying to figure it out yourself, even without information is a noble pursuit. When you get into the real world and are asked to create something completely new and novel, you can't just ask someone how to do it. You have to think for yourself.

Also, that's a shitty class if it doesn't have readings or notes. Maybe check the class facebook page. In all my classes we had a shared...