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 Jun17 comment Mathematica: How to convert scales to frequencies? To those voting to close: this topic is too old to be migrated anymore; go easy, y'all. Jun17 revised multiplication in GF(256) (AES algorithm) edited tags; edited tags Jun15 revised Proving $\|e^A\|\le e^{\|A\|}$ edited title Jun14 awarded linear-algebra Jun13 comment Help find hard integrals that evaluate to $59$? Ah, shoot; let me look for my notes on this... if memory serves, I trolled through OEIS and looked for generating functions. Jun12 revised Local maxima of Legendre polynomials edited tags Jun12 revised Solutions of $n$th derivative of $(x-a)^n(x-b)^n=0$ deleted 42 characters in body Jun12 comment Parallel to line on $f(x)=1+\sin(x)/x$ Well, since the discontinuity at $0$ is of the removable kind, I went ahead and defined the value of the function at $0$ to be the same as the value of an appropriate limit. Or, did you not tackle that limit while learning calculus? Jun12 revised Parallel to line on $f(x)=1+\sin(x)/x$ edited tags Jun12 comment Parallel to line on $f(x)=1+\sin(x)/x$ ...the function you were asking about. What else could it have been? Jun12 comment Any four points on the space curve given by the parametrization $(t,t^2,t^3)$ are noncolinear After noting that the matrix is Vandermonde, recall particular conditions on the rows for a matrix to be singular. Interpret geometrically. Jun12 revised An inequality from Littlewood's Miscellany edited tags Jun12 revised Is $x^x=y$ solvable for $x$? added 18 characters in body Jun12 revised Solve $x^x = a$ for known $a$? added 3 characters in body Jun11 revised Modular Arithmetic Calendars edited tags Jun11 revised Are there prime lengths in triangle with all integer sides and heights? edited tags Jun11 revised Higher Dimenional Tic Tac Toe edited tags Jun11 revised My sister absolutely refuses to learn math added 8 characters in body Jun11 comment My sister absolutely refuses to learn math @Kolyunya, " She probably wants to become an artist or something" so, ratio and proportions aren't important to artists? How about geometry? I'm not even counting those people who use actual math to make sculptures, e.g. Bathsheba Grossman or George Hart. Jun11 revised What 's the differece between $\cot(x)$ and $\arctan(x)$? edited tags