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 Apr 28 comment How does WolframAlpha calculate closed form approximations of irrational numbers? Another interesting related topic is en.wikipedia.org/wiki/Mathematical_coincidence . Have a look at Heegner numbers, a striking example is that $\exp(\pi\sqrt{163})$ is almost integer. Apr 28 comment How does WolframAlpha calculate closed form approximations of irrational numbers? Try to search on "experimental mathematics" (in particular read the wiki article on this topic) and on the integer relation algorithms (in particular the PSLQ algorithm, which was selected as one of the "Top Ten Algorithms of the Century"). You will see that it is not a massively precomputed table lookup. The algorithm is proved to discover a relation, but the empirical part is always to provide an information on what to relate. Here it is in a way a table look up. Apr 20 comment eigenoscillations of a sphere Almost got dizzy by looking at the solution. Imagine what would happen to inhabitants ... Apr 20 comment No font on axes in Plot3D graphics Very interesting feature, it looks like MMA knowns how approximately minus and dot look like (they do not occupy the whole vertical space), but just want to conceal the symbols... Apr 20 comment Finding very weak peaks Just a philosophical question, imagine you find what you call the "weak peak", will it help you ? I mean, will it help you to solve the original problem? Apr 12 awarded Popular Question Apr 9 comment How to get the long logic expression with a terse method Your equations vary in time ... Apr 7 answered double sum with condition Apr 4 comment Rounding the Corners of a Shape @AlexeyPopkov Thank you for testing the code. Mysteriously one comma disappear when editing... Now the code is corrected! Apr 4 revised Rounding the Corners of a Shape comma added in Polygon[l]}, {Red Apr 2 awarded Nice Answer Mar 31 comment Possible bug with ticks with superscripts, Labeled and Export to PDF possibly related mathematica.stackexchange.com/questions/47711/… Mar 31 answered Rounding the Corners of a Shape Mar 31 answered Plotting an ellipse given axial ratio and orientation Mar 30 revised Perform matrix/tensor contractions more efficiently added 199 characters in body Mar 30 revised Perform matrix/tensor contractions more efficiently added 782 characters in body Mar 30 answered Perform matrix/tensor contractions more efficiently Mar 25 answered What is the most efficient way to replace items in a list at periodic intervals? Mar 20 comment Closed form probability random walk will hit k >=1 times in n steps Make a substitution c[n,k]=1/2^n b[n,k] and solve it analytically. Mar 20 comment Closed form probability random walk will hit k >=1 times in n steps Isn't it contradictory: c[0,0]=1 according to the 1st rule and c[0,0]=0 according to the 2nd?