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Aug
20
awarded  Autobiographer
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)