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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
Dec
13
answered Singular integral: NIntegrate fails to converge