Archived threads in /sci/ - Science & Math - 1165. page

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https://drive.google.com/file/d/0BySUjG3NgLxubVhSN1owTG9sV2c/view

So ... does this look like it might go somewhere?

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Hi guys, im trying to learn about the brain and stuff, and lately tractography has piqued my interest
This technique is a way to visualize the movement of the water inside the axons of a neuron, and by giving it a color coding, you can infere the directions of the fibers and tracts.
Anybody knows more about this stuff? Recommended readings?

in this picture, we can visualize the corpus callosum, one of the main commisural pathways of the brain: in red, we se transvere fibers, in green, the antero-posterior ones, and in blue, the ones with supero-inferior directions.

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Hello /pol/, I've been looking at the fact that 0.999... = 1 and the people who deny it and I think the problem is the proofs themselves.

They are really weird. They use arithmetic tricks that don't look right. So I tried to come up with a proof by contradiction which would use inequalities and show why 0.999... cannot be smaller nor bigger than 1... but I haven't been able to do it.

Maybe someone here who knows more about the structure of rational numbers could try to come up with such a proof?

Thanks in advance, /x/.

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[math]0.\bar{9}\neq 1[/math]

I am serious. I looked at various algebraic and analytical proofs and they are all fallacious. Yet it is widely accepted that [math]0.\bar{9}[/math] indeed equals 1.

Why? Please explain to me without appeal to authority or other fallacies why [math]0.\bar{9}=1[/math] should be true. It does not maky any sense to me.

Let me make a similar example to explain my reasoning. Imagine there is a distance between A and B of 1 meter. Now this procedure repeats infinitely: 1. the distance doubles 2. you move 1 meter towards B. Even after infinite repetitions you will not reach B. Thus,
[math]\sum_{n=1}^{\infty }\frac{1}{2^{n}}=1[/math]
is merely an approximation and not actually true. Just like [math]0.\bar{9}=1[/math] is just an approximation and not actually true.

An other example is the following function:
[math]f(x)=\begin{cases}
1& \text{ if } x \geq 1 \\
0& \text{ if } x< 1
\end{cases}[/math]
Clearly [math]f(0.\bar{9})=0[/math] and [math]f(1)=1[/math].

This is a serious thread so please only make serious replies or don't reply at all.

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>He fantasises about having proved P = NP with a non-constructive proof.
>He then became very famous and rich, but he plays it modest with people, tells them that he's not that smart yet he says some cocky remarks to press.

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I would like to know what books of fiction do you guys (especially the ones who are studying physics and mathematics) find interesting.

In fiction, for example, are there books that you appreciate because of:

a) A beautiful language, some form of beauty manifested in words (Shakespeare’s plays, for example)

b) Interesting plots or compelling stories (like the mystery books of Raymond Chandler).

c) Great characters (like the works of Tolstoy).

Also, when it comes dow to philosophy, we know that many branches of it have evolved into modern science, and that huge portions of works from the past, whatever the beauties of their language, are now obsolete when it comes down to knowing the truth about the universe. Yet there are some fields of philosophy that might still be relevant today, like:

a) Ethics

b) Politics

>So, what books do you like to read? What philosophical texts do you recommend?

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What is free will? Is it real?

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>Set up Double Slit Experiment
>Put up a measuring device to see which slit the particles pass through
>Perform the experiment
>But don't look at either the projection screen nor the results from the measuring device
>Completely destroy the measuring device
>Look at the projection screen

What pattern do I see?

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Anyone have experience with calculators malfunctioning or miscalculating? I can confirm because the results I got from the calculator were different from wolfram and mathway. It was like two integers off on my calculator. Do you know how disappointing it is to go over an album length problem and be that little off? Fuckin sucks. Would re-flashing the expensive piece of shit calculator work or something?

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it's over gasoline is finished

>Iranian scientist Alaeddin Qassemi unveiled his new invention, a car that he says is powered by water, in Karaj, Sunday. The car can reportedly run on 60 litres (15 gallons) of water and is able to travel up to 900 kilometres (559 miles) in 10 hours. The power is generated after H2O is split into hydrogen and oxygen which react chemically to produce energy.

>According to the inventor, the car's engine only produces water vapour, causing next to zero air pollution. A litre (0.26 gallons) of water can reportedly generate some 96 megajoules (MJ) of energy while a litre of gasoline produces only 29 megajoules (MJ) of energy.

http://www.liveleak.com/view?i=63d_1480300743

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I get a thousand bucks a month in disability cheques thanks to schizophrenia.

Once my mother dies I'll most likely end up homeless because that shit is not enough to live on yo.

In the meantime, would it make mathematical sense to blow all of it every month on mega millions and various other high pay out lotteries?

pic unrelated but doggies are cute

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'if there is no color in space, why are pictures of earth taken from the orbit always colored?

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I am scared of antibiotic resistant diseases.
Comfort me /sci/.

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What is the gravitational constant? How was it derived?

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is pic related legit?