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 Feb 24 awarded Yearling Jan 22 awarded Popular Question Jan 17 comment Problem solving a second-order PDE The problem is that the set of equations are not a differential equation in $w$. Thus the error message from Mathematica. Jan 17 comment Problem solving a second-order PDE You are missing brackets around ps in the equation for e'. Jun 29 answered Mathematica computes wrong eigenvectors? Feb 24 awarded Yearling Jan 16 comment What's the pattern that will match a head anywhere in an expression How about patt[head]:= x_ /; ! FreeQ[x, _f]? Sep 30 awarded Explainer Feb 24 awarded Yearling Aug 30 awarded Good Question Feb 24 awarded Yearling Feb 16 comment Method that can be used to collect the variables of a function How about Sequence @@ f[x, y, z]`? Jan 23 awarded Nice Answer Jan 22 revised An apparently “simple” limit? added 228 characters in body Jan 22 comment An apparently “simple” limit? @Kagaratsch: 1 is the correct result.... Jan 22 answered An apparently “simple” limit? Dec 15 comment Remove annoying Conjugate It is actually interesting that Mathematica does not realise that the Sqrt are harmless. In fact, it can simplify the expression when removing the -2 and having the assumptions Im[es]==Im[kx]==Im[ky]==0. Dec 13 revised Singular integral: NIntegrate fails to converge fixed a typo Dec 13 suggested approved edit on Singular integral: NIntegrate fails to converge Dec 13 revised Singular integral: NIntegrate fails to converge deleted 11 characters in body