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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: TLAxevv.jpg]
Was 4chan named after the Fortran programming language used in the first assembly IBM computers?
13 more posts in this thread. [Missing image file: thesingularity1.jpg]
Speculation thread! What will life be like 10, 20, 30, 50, etc years after the technological singularity? Go.

AM/FM hybrid

4 more posts in this thread. [Missing image file: Poland-ball.jpg]
Apologies if this is a stupid question, or if this already exists, but would it be possible to somehow use a combination of amplitude modulation and frequency modulation to cram more bandwidth into a spectrum space? Hypothetically, of course. posting polandball because I don't have a relevant picture
3 more posts in this thread. [Missing image file: 1214137997719.jpg]
Ethical question for /sci/ Would it be ethical, rather than to cure AIDS, genetically modify it so it kills the infected before they can spread it? Not trolling, just did an ethics unit so curious what /sci/ thinks of things like this after I learnt that Bubonic Plague actually has a pretty low R0 value for this very reason.
17 more posts in this thread. [Missing image file: 26-neil-degrasse-tyson-1349299527.jpg]
http://youtu.be/2rjbtsX7twc I fucking love science
166 more posts in this thread. [Missing image file: sonde-ofria.jpg]
If aliens exist, why have no von Neumann probe reached us yet?
1 more posts in this thread. [Missing image file: original.jpg]
http://io9.com/nigerian-grad-student-uses-magnets-to-prove-gay-marri-1326215449 Why haven't you proved gay marriage is physically, mathematically, chemically and biologically wrong?
6 more posts in this thread. [Missing image file: Screen Shot 2013-09-14 at 11.28.54 PM.png]
Does anyone remember what this symbol means (looks like roman numeral two but connected at the top)? It looks like it's being used in place of summation symbol sigma.
2 more posts in this thread. [Missing image file: .png]
grrr... We're FORCED to work in a group for our biostatistics class to do our projects. The problem is my group is lazy... like really lazy. I'm trying to get a decent grade and want to put effort into the project. We split up the work, and one of the guys sends me the graphs he's going to submit for our project. We're supposed to use R (program) to generate the graph. He used excel. He didn't even bother labeling the axis. I don't know what to do... either these people are clinically retarded or think they can afford a lower grade. But I can't, I'm on a tight scholarship. I already tried telling them I'd be happy to do most of the work, but oddly they're averse to that plan too. They wanna split up the work and do the bare minimum for what they've got. I feel kinda bad because I came into the class late, and they were the only group willing to accept me. So they're not bad people, just lazy / stupid. What choice do I have? I don't wanna be an asshole and badger them about this or that detail / tell them their work is bad. But I don't want a shitty grade either. And I don't wanna tell my professor either, because he probably has better things to do than babysit us, like grading papers. I also don't wanna come off as arrogant.
5 more posts in this thread. [Missing image file: Koala.jpg]
Hey /sci/, help me out. My textbook says the Lewis structure of CH2NH2 is: CH2 -- NH2 (lone pair on N) <--> CH2 == NH2 How is this right? Why is it a resonance structure when in the first one, carbon doesn't even have an octet? Shouldn't it only be the one with the double bond?
15 more posts in this thread. [Missing image file: R.png]
How do I define recursive formulas in R? Very new to programming, and I'm trying construct a recursive formula, but I keep getting error messages. What I've got: > y <- function(y) { + if(y==1) + return(1.5) + else + return(1.022*function(y-1)) At which point I receive: Error: unexpected '-' in: "else return(1.022*function(y-" I'm just really confused because I created my code my mimicking a recursive formula (the factorial formula) that I copy+pasted into R which worked just fine, so where's the problem with mine?
8 more posts in this thread. [Missing image file: tumblr_msu5cyoHk51rk74v1o1_1280.jpg]
Greetings, /sci/. I recently came up on a question about a proof. On stackexchange, the user inquired about what the proof would look like for this question: >Show that if x and y are real numbers with x<y, then there exists an irrational number t such that x<t<y. The link is here: http://math.stackexchange.com/questions/46822/density-of-irrationals It's a bit old, but I found it randomly while web surfing. Anyway, I was thinking that after considering x >= 0 and y - x > 0, one could make use of the Archimedian property and acquire n(y-x) > 1. This is fine, I get this. But, why can't you simply multiple by the sqrt(2). Doing that, you obtain the following: sqrt(2)n(y-x) > sqrt(2) sqrt(2)ny - sqrt(2)nx > sqrt(2) sqrt(2)ny > sqrt(2)nx + sqrt(2). Now, by well ordering, we can find an m such that sqrt(2)nx < m. Then, this implies m - 1 <= sqrt(2)nx < m. Doing all the algebra and stuff, we get sqrt(2)nx < m < sqrt(2)ny Dividing by sqrt(2)n, we get: x < m/sqrt(2)n < y. Clearly, m/sqrt(2)n = sqrt(2)m/2n is irrational and that satisfies our t. Question is: Why didn't this person do this? In fact, why didn't anyone? Is there some glaring error I'm missing? Why not just multiply the shit by sqrt(2) and continue on, letting sqrt(2)m/2n = t?
6 more posts in this thread. [Missing image file: 954842_609330232421325_920036622_n.jpg]
Best arguements on whether or not the Universe is infinite? Im looking for scholarly articles or equations that the PHYSICAL universe is infinite. Also feel free to give your input.
12 more posts in this thread. [Missing image file: earth.jpg]
Hey /sci/ How can I prove that the earth is moving? I need a simple experiment that can be done and explained with everyday things. This is to argue against someone being purposefully ignorant insisting that, say, the sun and stars are going around the earth.
5 more posts in this thread. [Missing image file: Georges Lemaître.jpg]
Does the second law of thermodynamics negate the possibility of a static universe? Because that's what I've heard. And if that's the case, then why was Lemaître's theory of the expanding universe met with such skepticism? Shouldn't scientists have known that the universe was dynamic even before Lemaître worked out the math to prove it?
15 more posts in this thread. [Missing image file: m2d9_hubble_985.jpg]
If 100% of the solar energy that hits the earth was harvested for one day with no loss (perfect storage). How long could we power earth?
5 more posts in this thread. [Missing image file: cyber woman with corn.jpg]
how to cook a disease that will kill someone?
26 more posts in this thread. [Missing image file: Perelman,_Grigori_(1966).jpg]
What do you guys think of Grigori Perelman? Any fans of topology here?
5 more posts in this thread. [Missing image file: 1318718367788.jpg]
Let's play a game. Whoever can think of the biggest number wins. My number is 1 million! can you beat that?
1 more posts in this thread. [Missing image file: 20130903185230-Nikola-Tesla.jpg]
If your so smart then why havent you scammed plebs out of 17k? http://www.indiegogo.com/projects/home-quantum-energy-generator






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