dingo_d
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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)