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 Jan27 comment An example of a problem which is difficult but is made easier when a diagram is drawn Can you post the diagram? Jan13 comment Why does notation for functions seem to be abused and ambiguous? @KCd Oh he knows what's going on. I think he is just venting. Dec25 comment What do bitwise operators look like in 3d? Woah. 15char... May17 comment Nuking the Mosquito — ridiculously complicated ways to achieve very simple results Huh, this is how I would solve it. May17 comment Nuking the Mosquito — ridiculously complicated ways to achieve very simple results I wonder if any of them tried imagining the square. The official solution is fairly amusing :) May17 comment Nuking the Mosquito — ridiculously complicated ways to achieve very simple results Isn't this true for all integrals? (not just integration by parts) May17 comment What is the most fundamental trigonometric function: cosine or sine? Agreed. (Though I am biased towards $\cos(x)$ because of the Discrete Cosine Transform) May9 comment Hanging a picture on the wall using two nails in such a way that removing any nail makes the picture fall down Ah, slots beside the nails. I knew there would be an easy solution ;) May9 comment Is there an identity for cos(ab)? It does not have to be an integer: math.stackexchange.com/a/787186/12438 May9 comment Is there an identity for cos(ab)? @ColeJohnson There is a formula if $a$ is any integer. May8 answered Is there an identity for cos(ab)? Apr10 comment Visually deceptive “proofs” which are mathematically wrong -_- Now that's just silly. Apr8 comment Visually deceptive “proofs” which are mathematically wrong @Oliver They are not being serious, right? Mar28 comment Can a piece of A4 paper be folded so that it's thick enough to reach the moon? Somehow I just knew someone here would brute-force 2^x :) Mar20 comment How does the exponent of a function effect the result? What are you smoking? $x^\frac{m}{n}$ is perfectly defined! Mar17 comment Definition of convolution? The Cross-correlation does use x+y. Jan23 comment How do I convince my students that the choice of variable of integration is irrelevant? I just knew that someone would write a program to show this :P Jan4 awarded Yearling Nov2 comment Find the limit of $\frac{\bar{z}}{z}$ as $z$ goes to $0$. @DavidThompson For a limit to exist, it has to have the same value, no matter which direction you approach the limit from. This shows that the function approaches a different value depending on $t$. Oct29 comment How can I find the limiting value of a time-dependent PDE? Perhaps you can take the laplace transform and then use the Final value theorem to find $f(\infty)$