MatrixFrog
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 Jul13 comment A proof in circles. I suspect that any proof will involve the center of the circle but I'm not quite sure how to prove that. Jul13 comment A proof in circles. CD=(3/4)AB? Is that a typo or am I misreading? You said at the beginning that CD=(1/2)AB. Jun24 comment Can you explain the “Axiom of choice” in simple terms? Even though I didn't follow the details, I remembered what the Banach-Tarski theorem was, well enough to understand a visual joke in tonight's season premiere of Futurama, eight months later! Thanks! Dec10 comment Using 4 '8's, get the number 24 8 + 8 + 8 and then I don't even need the fourth one, thus my solution is presumably 75% more efficient than the intended one! Oct14 comment Boolean Simplification wolframalpha.com/input/… won't show you the steps it took to get all its answers, but may come in handy at some point... Sep25 comment Is there possibly a largest prime number? I think this a great question. The answer is on Google and Wikipedia and elsewhere, but the explanations you found out there are probably hard to understand. There are some people here who could answer this in really nice, plain, understandable language. +1 for sure. Sep9 comment Your favourite maths puzzles Hm, I thought you could. Is there a math.stackexchange question on this? Sep8 comment Your favourite maths puzzles If you have unlimited time and cash, then just keep playing until you're ahead. It'll happen eventually. I must be misunderstanding. Aug27 comment What is $\sqrt{i}$? +1 for introducing me to the term "Argand diagrams" which I'd never heard before. I always just heard "representations in the complex plane" or something. Aug25 comment How to convert a hexadecimal number to an octal number? Does this really fall under "number theory"? I thought number theory was all about the values of numbers, not the notation. Maybe I'm being nitpicky, or maybe I'm just totally wrong. Aug22 comment Pendulum with moving pivot Possibly better suited to stackoverflow. Physics/math questions are okay there, as long as they're programming-related, which this certainly is. Aug11 comment Is It True that We Can Never Be Sure of Validity of a Mathematical Proof? Because computers (designed and built by people, running programs written by people) are way less fallible than people? Jul31 comment How can I understand and prove the “sum and difference formulas” in trigonometry? (cos(a ± b) = …, etc.)? I prefer the geometric perspective too, and it just seems like you shouldn't need to know anything about imaginary numbers to understand these identities. Which is why I asked the question. The big insight I'm getting of course is that the two ways of looking at it are really not that different. Thanks! Jul31 comment Why does Benford's Law (or Zipf's Law) hold? Similar question: math.stackexchange.com/questions/58/… Jul31 comment Real life usage of Benford's Law Similar question: math.stackexchange.com/questions/781/… Jul31 comment Is there a tool for drawing column and row vectors? Looks like there is at least one interesting answer for each. Why don't you edit this question to clarify what you meant, and then start a new question for the other one? Jul31 comment A definition of Conway base-13 function "and a non-terminating one ending in repeated p digits" -- this is analogous to the fact that 1/100 can be represented in base 10 as 0.01, or as 0.0099999..., correct? Jul31 comment A definition of Conway base-13 function I would have used A, B, and C, like programmers do when writing numbers in hexadecimal. But then, a and b already have meaning in this context, so maybe T, E, and W (suggesting their values, Ten, Eleven, and tWelve). The p, d, and m, used by Niel de Beaudrap, is not bad either. Jul30 comment A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language "there is a way to order the integers (or any countable set) that makes it into a continuum." Wait, really? How do you do that? Do you have a link that discusses this ordering?