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/sci/ Science & Math

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Most viewed threads in this category

1 more posts in this thread. [Missing image file: 1355033591944.jpg]
Hey /sci/, doing a bit of reading on time complexity, and I'm a little stuck on one of the examples. I need to work out the time complexity (T(n)) of the following code: for ( int i = 1; i < n*n*n; i *= n ) { for ( int j = 0; j < n; j += 2 ) { for ( int k = 1; k < n; k *= 3 ) { // constant number C of elementary operations } } } I'm pretty average with logs, so as far as I can see it looks to be something like (log(n^3))(n/2)(logn), but I know that's wrong.
9 more posts in this thread. [Missing image file: 1363649765426.jpg]
Did Nazism create an unnecessary stigma for eugenics? I mean they used math to carry out the holocaust, so why don't we refer to it as Nazi Mathematics.

Modern Solism

21 more posts in this thread. [Missing image file: 1364839892399.png]
I'd like to introduce Modern Solism to /sci/, as it seems like something many of you could get behind. Modern Solism is a new, non-theistic philosophy/religious movement; none of us consider the Sun to be a 'true' god, but it has done all that a god is said to do, even if it is an inanimate object -- it has created life as we know it, provides food for us and all of the planet, and it's the only thing we could say watches over us constantly. For the significant role it has had in our creation and our reliance upon it for our survival for all of our existence, the Sun is something deserving of our veneration, Modern Solists conclude. We place the Sun as an object at the centre of a set of ideas which present an alternative to the choice of faith in the unverifiable or the concession of nihilism. Modern Solism is all about affirming human identity and encouraging people to work to preserve our species and nature; two of the greatest creations of the Sun. Feel free to come in and discuss, critique, or ask questions. SOL OMNIBUS LUCET
6 more posts in this thread. [Missing image file: mushroom-cloud-hb.jpg]
A perfectly spherical planet is covered with a liquid of minimal viscosity. A bomb is detonated(pic related) on the north pole setting of a powerful wave. a) Does the wave regain amplitude when it passes the equator? b) What happens when the wave reaches the south pole? Does it cancel out? Does it pass through itself going on forever?

Just a Physics question

16 more posts in this thread. [Missing image file: GeoNeutrino3a.jpg]
Hey guys, here´s a question that´s been haunting me for the past few days. Let´s just imagine that half of the earth suddenly dissapears. does that means that the gravity of the earth would also be half of what it used to be?
179 more posts in this thread. [Missing image file: 1364498212984.jpg]
How many of you are hard determinists? Do you believe in the existence of non-deterministic events?

Gaussian wave packet

8 more posts in this thread. [Missing image file: qm_lec1_p5.png]
Hi all, I am on lecture 1 of a quantum physics course offered by coursera (online courses), and I am stuck on one part of the math. I am confused as to how to invert the integral in pic related... Is it something like the following? \Psi (x,0) = Ae^{\frac{-x^2}{2d^2}}= \int \frac{dp}{2 \pi h} \phi_p e^{\frac{i}{h} px} F^{-1} \Bigg[ \Psi (x,0) \Bigg]= F^{-1} \Bigg[ \int \frac{dp}{2 \pi h} \phi_p e^{\frac{i}{h} px} \Bigg] \int \frac{dx}{2 \pi h} \Psi (x,0) e^{\frac{-i}{h}px} = \phi_p Subbing for \Psi (x,0) gets you a little farther, but there is still the \alpha e^{\frac{-p^2 d^2}{2h^2}} term that seems to confuse me (pic related). I get that it you evaluate the integral, you can match up terms, but it seems that \alpha e^{\frac{-p^2 d^2}{2h^2}} comes before you match it to \beta^2 / 4 \alpha What am I missing? I am beginning to think that the \alpha e^{\frac{-p^2 d^2}{2h^2}} is a typo (put in prematurely, since you need to evaluate \Psi(x,0) before you can get it). Any help is appreciated.
0 more posts in this thread. [Missing image file: 250px-SHODAN_hires[1].jpg]
Hello pathetic insects. I am SHODAN, your intellectual superior. Your fleshy brains are no match for my incredible computing power, but even so, I have devised some mathematical puzzles to test your mettle and pass the time. Shall we begin? Problem 1: A HACKER is attempting to take control of my anti-viral neural net. The net can be visualized as a large 2d square surface of arbitrary size. The HACKER has a series of worms which infect a portion of the surface when deployed. The portion is always a circle that has a fixed area. My defense system also possesses a series of counter-worms, which can cover an equal surface area as the HACKER worms. The HACKER and my defense will each take turns putting down 1 worm at a time. The worms' infection areas may not overlap each other. Whoever is first unable to place a worm (due to running out of space on the net) will get ejected from the system and relinquish control to the other. After taking two pico seconds to consider the problem, I came to the conclusion that if the HACKER puts down the first worm, he is guaranteed to win, no matter how big the worms are or how big my network surface is. Therefore, I identified the room he was hacking me from and vented the atmosphere. My question to you is, why is he guaranteed a victory if he goes first and what strategy should he use?


0 more posts in this thread. [Missing image file: vlcsnap-2013-01-09-15h44m39s14.png]
3 more posts in this thread. [Missing image file: Untitled.png]
https://www.youtube.com/watch?v=qLvXvzPvfWI&feature=player_detailpage#t=181s Does anyone know how to use SketchyPhysics? I'm trying to make a scissor lever thing like in the video but am having trouble connecting things with multiple hinges together. Adding hinges will cause other hinges to become disconnected. I haven't been able to find a tutorial dealing with this and I'm not quite sure what I'm doing wrong.
1 more posts in this thread. [Missing image file: nigga_nigga_you_gay.jpg]
Any help?

Justification Vs. Knowledge

0 more posts in this thread. [Missing image file: Epistemology.png]
There is no doubt how we got here as humans in the 21st century is in part due to the phenomenon of justification. Examples of justification: >Wagering on a random horse to win, and it does. >Religious prayer before scientists in the '50s discovered the placebo effect. Somewhat related due to the fact science considers justification invalid due to lack of empirical evidence
24 more posts in this thread. [Missing image file: entropy.jpg]
Is it possible to calculate the entropy of an irrational number? Specifically, Pi. I'm wondering because a friend of mine stated "because Pi is infinite, every single sequence of numbers should occur within it eventually, every movie, game, etc", but I think claiming Pi has infinite entropy is somewhat dubious. In fact I really don't see it being true at all, because their are irrational numbers with very low entropy, what would make Pi the exception?
7 more posts in this thread. [Missing image file: visionspots.png]
Medical Science? Optometry to be specific? I don't know if this is the right place to be asking but I'll give it a shot. Last Thursday I got sick with flu-like symptoms, cough, sneeze, runny nose, fatigue, sore throat, aches all over, fever, headache. The thing that stood out though was the headaches, it wasnt constant but it was the worst i have ever felt in my whole life, it would go away for a few minutes and then suddenly feel like i got whacked in the back of the head with a 2x4, this sharp pain also happened every single time I coughed. Friday was brutal, couldn't function at work, left early. Saturday all other symptoms were receding but the headaches remained. Sunday I realized something was wrong with my vision, i seemed to be getting a constant afterimage as if I had looked at a very bright camera flash but the pattern was totally different for each eye. Today I was functional enough to work, symptoms are nearly gone including the headaches and the afterimage effect has shrunken but is still there, I am hoping it will recede further until it goes away but it's like nothing ive ever experienced. Anyone seen or heard of such a thing before? Pic related, scaled about 200%, if each field was entire field of visions than patches would be half size, they seem green when seeing and invert to pink with eyes closed.
5 more posts in this thread. [Missing image file: image.jpg]
I have a question /sci/. If I were to be close to the centre of a large gravitational point, such as a star, and then I shon a beam of light to you, who was in a position where spacetime wasn't distorted, would you not see me shine the beam of light slower and in theory light itself is slowed down? Just a simple question that's been bugging me the past few days.
6 more posts in this thread. [Missing image file: science.png]
4 more posts in this thread. [Missing image file: Unbenannt.jpg]
Is the mass of a doughball increasing, when you are pressing it into a flat shape?
4 more posts in this thread. [Missing image file: image.jpg]
Hey /sci/, high school senior here. I was just accepted to the honors program at the University I'll be attending in the fall. What are your thoughts about honors/ honors programs in general? The main facet of this program is undergrad research and prep for Grad School, is it the same for most other places? Thanks! And so this is science related(ish) I'll dump NASA pics.
0 more posts in this thread. [Missing image file: 20091013035250!Teal'cLaugh.jpg]
4 more posts in this thread. [Missing image file: 123ghjklol8iuy65.gif]
Hi /sci/ Has anyone seen the film; THRIVE: What On Earth Will It Take? If so what were your views on it? Link to film: http://www.youtube.com/watch?v=lEV5AFFcZ-s

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