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What physical evidence supports great oxygen event theory
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>>8971518
https://en.wikipedia.org/wiki/Great_Oxygenation_Event
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banded iron formations (soluble ferrous iron turning into insoluble ferric iron in the oceans), absence of detrital pyrite and uranite (oxidizing atmosphere degrades those minerals during transport), no more mass-independent fractionation of sulfur isotopes (fractionation signal from UV is scrambled by reactions with oxygen in the atmosphere), etc.
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Information on its Wikipedia entry
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is tyrosine safe for highschoolers?
i need something to cope with dysfunctional family and school problems.
my dad just came in threatning to beat me up if i dont fold the washed clothes.
can tyrosine fuck up your dopamine receptors?
planning to order from amazon, was honestly gonna wait till college to do stimulants and depressants but cant take it any longer
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>>8971508
Tyrosine is an amino acid. It's in literally all of your food. And it wouldn't get you high or anything so I don't know how it will help you cope.
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>>8971511
i read it can improve your mood and reduce stress
its in the "nootropic" category so i imagine it can be used for "self improvement"
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Does medicine contradict the law of natural selection? The main purpose of medicine is to save lives that otherwise would be lost due to the person's inability to overcome their own genetic or acquired diseases.
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natural selection is a descriptive law, not a moral one
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No, it just changes what things are selected for.
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>>8971423
Natural selection occurs regardless of whether humans overcome nature through medicine, so it's not logically a contradiction of the law of natural selection. If you mean to ask whether natural selection applies when medicine is used to direct our own survival depends if you consider "natural" to pertain only to incidental factors, such as the disease agent's own viability, the chance that a human being has a favorable genetic adaption or would acquire a genetic adaption to the disease agent, the degree that a human being can spread a genetic disease through subsequent generations, etc.
Intellect itself can be argued to be an adaptation to challenges presented by nature, which, when applied to medicine, allows us to overcome genetic and acquired diseases, therefore I don't see the direction of our own survival through medicine to be a contradiction.
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Are there any sources or individual pages that could provide me reliable information on natural and formal sciences?
I am starting to get interested in maths, physics, chemistry and biology and want to learn to solve problems in these fields
I am willful to learn but never truly paid attention in class, what I learned was because I was forced out of bad school notes, now that it's summer I wanted to catch up some material and most of all make up for the things I missed as I'm growing interest for them but can't find any pages where I could start anew from the very beginning and learn until I gain understanding to their different approaches, I think I speak for all when I say that most of my confusion comes from the fact that mathematics later take up a form where they don't use (understandable) logic anymore
I am also interested in astronomy, earth science, materials science, history of the universe, natural philosophy, theoretical linguistics, logic and theoretical computer science if there are any pages dedicated to these
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>>8971345
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>>8971349
don't fall for the memelist OP
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>>8971350
>repeating the memelist meme
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The mitochondria is the powerhouse of the cell
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fuck off with your shitty reddit memes
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>>8971321
fuck you back, not an argument
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Is there a scientific reason to why I am attracted to girls with Nordic features like
>Thin, broad nose
>oval face shape, tall and broad forehead
>natural blonde hair, blue eyes, and pale skin
>straight/even facial profile
>eyebrows pointed downward on ends
Why are these attractive features?
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>>8971269
Beauty is subjective, anon. Any attempt to objectify it will only lead to disappointment.
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>>8971273
t. Shillbergstein
I'm sexually attracted to pineapples. And thanks to your encouraging statement I'm gonna just bite the bullet and slap my dick on it some
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>>8971269
>Thin, broad nose
What did he mean by this?
Anonymous
The "sum" of all natural numbers 2017-06-12 06:51:04 Post No.8971231
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The "sum" of all natural numbers 2017-06-12 06:51:04 Post No.8971231
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The "sum" of all natural numbers
Anonymous
2017-06-12 06:51:04
Post No. 8971231
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Hello /sci/,
Riddle me this. If ζ(-1) = 1 + 2 + 3 + ... is -1/12, and ζ(0) = 1 + 1 + 1 ... is -1/2, then wouldn't ζ(-1) - ζ(0) = 0 + 1 + 2 + 3 + ... also equal -1/12? But clearly -1/12 - (-1/2) ≠ -1/12, right?
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>>8971231
Rieman zeta is an analytical continuation. The definitions are defined by a unique continuation from the valid range, not by addition and algebra.
So no
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>>8971239
Then why is it that in physics ζ(-1) is used in place of 1 + 2 + 3 ... ?
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>>8971239
By the way, to be clear I already know that the values of ζ(x + iy) with x < 1 are uniquely defined due to the properties of meromorphic functions. I'm questioning why those values are being used to define the value of series like 1 + 2 + 3 ...
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>the series expansion of 1/(1+x^2) around 1 has a radius of convergence √2 because this is the distance from between 1 and the function's nearest singularity (which is at i) when you view x as an element of the complex plane
Why is complex analysis so beautiful, anons?
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>>8971176
Such is the nature of "imaginary" worlds.
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>if two functions are holomorphic on a connected open set D and the functions are equal on a subset of D that has a limit point inside D, then the functions are equal on the entirety of D
>if f(1/n)=g(1/n) for all n then f=g everywhere
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>the value of a holomorphic function a point is completely determined by the averaging the function's values around a random loop enclosing that point
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Whats the scoop on Integration, derivatives, anti-derivatives and differentiation?
I hear these terms often but have never taken calculus.
Could someone give me an overview?
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>>8971050
You're basically asking for an overview of a typical semester's content (inb4 >taking Calc I in college and some story about how smart you are) which isn't gonna tell you much or stick. If you really wanna know what they mean you're gonna have to crack open a book like most people did and come up with some specific questions.
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Derivatives= rate of change
Differentiation =finding a derivative
Integral=area under a curve
Antderivative= indefinite integral
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>>8971061
The antiderivative of f is defined as the function whose derivative is f.
It just happens this is the area under the curve
Anonymous
ITT funny work stories in the lab or classroom 2017-06-12 03:31:12 Post No.8971040
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ITT funny work stories in the lab or classroom 2017-06-12 03:31:12 Post No.8971040
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ITT funny work stories in the lab or classroom
Anonymous
2017-06-12 03:31:12
Post No. 8971040
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>some girl is going around the lab asking people if they want to sign a petition to form a graduate student union, some people say yes, others no
>she asks everyone, but passes by my bench for some reason
>"Hey, why didn't you ask me? I'm a graduate student!"
>"Oh, sorry. Do you want to help sign my petition to start a union?"
>"No!"
>Everyone bursts into laughter and she leaves in a huff
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>being anti union
falling for the porkie psy-ops memes for over a century
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>>8971059
I'm not anti-union but I was graduating that year so a union wouldn't have benefited me. I want the rest of them to suffer.
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>>8971062
https://www.youtube.com/watch?v=0jsQEwW4DVw
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Has anyone here suffered from TBI, stroke or any other type of brain injury?
How do you deal with it? Did it affect your academic performance
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>>8971021
Bonus article about some dude that fried his brain with a proton beam and lived:
https://en.wikipedia.org/wiki/Anatoli_Bugorski
http://www.todayifoundout.com/index.php/2010/03/what-happens-when-you-stick-your-head-into-a-particle-accelerator/
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Yes suffered two strokes (3 weeks apart) due to vertebral arterial dissection. Caused cerebral brain injury
Had to learn how to walk again. My memory continues to be patchy. My sense of time is particular bad (often have to think hard to remember age or current year)
But came first in my postgraduate law course, do well at work and hold my own at my chess club. Although to be fair I have to work harder at these things to succeed
Occasional fuzzy patches in my brain. sometimes I 'vague out' mid sentence. This happens most when I am sleep deprived. I don't share MT history with colleagues and recent acquaintances. None would suspect, although some may consider me absent minded
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>>8971021
a got a big ole dent in the head as a child and it gave me STEM autism
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This is not a homework question, but it's similar, I'm studying for my exam. And I'm sorry for asking, but I can't put a dent in it for over a day. I keep coming back to it, and I don't know what to do.
So, I need to show this function is continuous at (1,0), and WolframAlpha shows it is (http://www.wolframalpha.com/input/?i=Limit%5B%5B%2F%2Fmath:ln%5E3(x)%2F(sqrt((x-1)%5E2%2By%5E4)-1)%2F%2F%5D,+%7B%5B%2F%2Fmath:x,y%2F%2F%5D%7D+-%3E+%7B%5B%2F%2Fmath:1,+0%2F%2F%5D%7D%5D).
Before even trying WA, I tried to disprove that the limit exists, at x=1, y=0 and x-1=y, and I keep getting zero. The only way I know of proving a limit exists is a squeeze th. And that's where I can't move further from 0<=abs(f(x,y)), and then recognizing that the denominator is >=0. That's it, I have no idea what to do next. I beg of you, any suggestions would be much appreciated.
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Also, for what is worth, I've been googling for ages. And any squeeze th. examples online are just way to easy. I have no CHANCE of getting something like that on my exam, our professor is a complete sadist.
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Please guys, people who are good at calc III are very scarce, I have literally no one to ask, all I find online is obvious stuff.
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Could I expand (x-1)^2 to get x^2-2x+1 and then get rid of x^2 and y^4?
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Every set can be well-ordered, and theorems about well-ordered sets can be proved by the means of induction. So can we define well-order on [math]\left\{z\in\textbf{C}: 0<\Re(z)<\frac{1}{2}\right\}[/math] and prove Riemann hypothesis inductively?
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>>8970823
No and no
Show me an inductive construction of the set of real numbers
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>>8970832
https://en.wikipedia.org/wiki/Transfinite_induction
OPs description of a proof works at a very high abstract level. But the details are surely impossible.
A well ordering of that set isn't going to be anything friendly for an inductive proof.
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>>8970832
>disproving well-ordering theorem with just one word
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0.000...001 = 0
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Fuck off.
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[math]0.\overline{9}=1[/math]
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>>8970796
1/10 = 0.1
1/(10^2) = 0.01
1/(10^3) = 0.001
...
1/(10^n) = 0.00...01 = 0
as n approaches positive infinity.
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if learning a skill is basically creating the synapses for it.
how long does it take for the brain to create the synapses of a new skill?
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If you're 150+ IQ genius like me, then it happens instantly.
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>>8970709
as long as it takes to learn it
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>>8970709
I don't know asshole. Maybe just practice? Dipshit.