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/sci/ board - Science & Math

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Most viewed threads in this category

Need help

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I need to shorten this: (39^175-175^39)/(39^175+175^39) Please help me
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How to study? Seriously,what is the best way, the best method? There is only this way, You will in class, pay attention, take notes, back to class and read the book, then it resolves the issues. Is it? I just wanted to be a genius.
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Why are America dicks bigger than Asians?
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I need your help. In the picture you can see my setup. The A and B has the phase and 0 switched around and it doesn't matter if I use the outgoing + or - from the power supply. I want to figure out 1) Why does the diode light up in the first place as the chain is not complete. 2) Why does it change like in the picture when I change the phase and 0?
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Why force children to learn algebra, trigonometry and calculus when very few of them are gonna use them as adults?
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Given that computer power is not an issue - what kind of problems in the natural sciences can be then be solved in their entirety?
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Hey /sci/, I would like to hear some words of wisdom from people with knowledge and possibly working experience in IT security. I have one year left in my masters study in mathematics, and somehow I ended up interested in information security. I have solid math background, took courses of both theoretical and applied cryptography, number theory, elliptic curves cryptography, etc... I consider my self no genius, so more than being a pr0 cryptographer, I'd like to do more applied stuff, like practical sw or network security. I know all the math behind it is not really THAT important for an engineer, but it sure won't hurt that I know it. My question is, what should I self study to be able to work as an actual IT security specialists? networks stuff, tcp/ip, programming (what language?) is pretty obvious. what else?
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Will you die if you smoke one weed?
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Do you believe there are Universes with different laws? Do you believe there are other Universes at all?
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Everyone knows that water puts out fire, but through what mechanism does this actually happen? Does the water blanket the fuel and prevent oxygen from combining with the fuel, cool the fuel down and take away the necessary activation energy, or something else. Sorry for the stupid question.
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Phy101 student here. Is there a way to prove fundamental concepts such as inertia? The intuitive bits are pretty simple, e.g. an object doesn't move without force, and it has no reason to stop other than if another force acts on it. Great idea, now where's the proof?
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Define "luck" in scientific terms
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Lets assume FTL travel is impossible or at least impractical. We spend the next 2 or 3 thousand years filling up the Sol system; a terraformed Mars, habitats of all shapes and sizes, tens of billions of human beings. Maybe even figuring out what to do with Venus. As always there will be wars and refugees and those who are just plain unwelcome anywhere. When the Puritans left Europe they left all of human civilization for nothing,for nowhere and they were glad to go. The first interstellar colony will be a fleet of habitats are leaving behind nothing but oppression and possibility genocide. They will putt-putt-putt at a tiny fraction of c to a nearby star and if they survive that system and everything inside it will belong to them and there descendants. My point; interstellar distances are no answer to Fermi's paradox. Your thoughts?
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Is there any way to prove, that f:A -> B, f bijective, f\circ f^{-1} (x) = f(f^{-1} (x)) = x ? It was stated in my textbook "Introduction To Real Analysis" by Bartle and i wondered how to prove it. my attempt at a proof f bijective \Rightarrow f^{-1} bijective. \exists unique a \in A s.t. f^{-1} (x) = a thus (x,a) \in f^{-1} \exists unique b \in B s.t. f(a)=b thus (a,b) \in f as above (x,a) \in f^{-1} \Rightarrow (a,x) \in f and knowing if (\alpha, \beta) \in f and ( \alpha, \gamma) \in f \Rightarrow \beta = \gamma thus b = x thus f \circ f(x) = f( f^{-1} (x) ) = f(a)= b = x as you may guess, this is my first time doing analysis
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Has anyone on /sci/ conquered rhotacism? I've had it all my life. For the next two weeks I'm going to be going through speech therapy guides on how to better pronunciate r. Probably not the best board for this, but speech therapy is definitely related to the science of speech. >inb4 post it in /r/
http://lifecompetes.com/ 26 posts and 0 image replies omitted. Click to view.
http://lifecompetes.com/
I've always been... 7 posts and 0 image replies omitted. Click to view.
I've always been interested in theories of the universe. What if our universe is actually a tiny particle within part of someone else's brain, and inside our brains exist other universes and so on. What are some interesting theories you've thought of or read about?

The Secret to Happiness Revealed (No, seriously)

The Secret to Happiness... 0 posts and 0 image replies omitted. Click to view.
Holy shit!! That was so well written. So hopeful :D http://skeptikai.com/2013/09/14/the-secret-to-happiness-revealed-no-seriously/ I see now that I can actually do something about my happiness
http://www.bbc.com/news/science-environment-29093700What... 8 posts and 0 image replies omitted. Click to view.
http://www.bbc.com/news/science-environment-29093700 What do you think about this /sci/?
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I'm very bad at math. Can someone please help me understand something that's been bugging me for months? This isn't for school or anything; just trying to learn on my own. It says here that dy/dx = f(x,y) and that this is the slope for y = f(x). And this is confusing to me because isn't f(x,y) an function of two variables whereas f(x) has just one? So what's going on here. Also, isn't the output of a function f(x,y) supposed to be the z coordinate? Like z = f(x,y), so how come they plot it in 2D? And also there's some functions f(x,y,z) which are even more confusing. pls respond
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