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seen Aug 27 at 18:54

Feb
21
comment Integral over orthogonal cylindrical harmonics
Of the top of my head I'd say residues, altho Mathematica gives $\frac{-1+e^{-2 i \pi (m-n)} (1+2 i \pi (m-n))}{(m-n)^2}$
Feb
3
comment Matrix exponentiation problem
This is also great answer, thanks. I got why I would get the sines and cosines, but I forgot how to multiply o.o
Feb
3
accepted Matrix exponentiation problem
Feb
3
comment Matrix exponentiation problem
OMG I'm so stupid! now it makes perfect sense. Thanks!
Feb
3
asked Matrix exponentiation problem
Jan
18
accepted Given the generators of a group find the parametrization matrix
Jan
18
comment Given the generators of a group find the parametrization matrix
Oh! My mistake! Sorry :D Now it's good :) Thanks for the help :)
Jan
18
comment Given the generators of a group find the parametrization matrix
Is it just normal matrix multiplication or?
Jan
18
comment Given the generators of a group find the parametrization matrix
$\left( \begin{array}{cc} a e^{-b} c+\left(1-a^2\right) \left(1-c^2\right) e^b & e^{-b} a+\left(1-a^2\right) c e^b \\ c e^{-b}-a \left(1-c^2\right) e^b & e^{-b}-a c e^b \\ \end{array} \right)$
Jan
18
comment Given the generators of a group find the parametrization matrix
But when I make a product I get $1-2c^2$ for determinant :\ Am I doing something wrong?
Jan
18
comment Given the generators of a group find the parametrization matrix
Ok, so my matrix M should just be the product of these three? Because I don't get that the M has determinant 1 :\
Jan
18
comment Given the generators of a group find the parametrization matrix
Is this unique solution or are there others? How did you find those that fit the $F_i(0)=e$ and $F_i'(0)=e_i$?
Jan
18
asked Given the generators of a group find the parametrization matrix
Jan
17
awarded  Commentator
Jan
17
comment How do I know that a group generator really is from that group?
This sounds alright to me. I'll say this to my mentor and see if he agrees with it :)
Jan
16
asked How do I know that a group generator really is from that group?
Nov
14
comment Four product of sphrerical harmonics
Is this about 3j and 6j symbols? I think I saw a similar post on math.SE but I cannot find it...
Sep
1
awarded  Benefactor
Aug
31
comment Solving ODE with negative expansion power series
I'll look it up, maybe I find a proper name for this :D I'll give you bounty in an hour (at least that's what M.SE says :D)
Aug
30
comment Solving ODE with negative expansion power series
Oh and, while I'm at it, do you have any material on this kind of solving method? If it has any special name so that I can google it or sth like it? I'd be really grateful, since I looked all over but had no luck...