dingo_d
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 Feb21 comment Integral over orthogonal cylindrical harmonics Of the top of my head I'd say residues, altho Mathematica gives $\frac{-1+e^{-2 i \pi (m-n)} (1+2 i \pi (m-n))}{(m-n)^2}$ Feb3 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 Feb3 accepted Matrix exponentiation problem Feb3 comment Matrix exponentiation problem OMG I'm so stupid! now it makes perfect sense. Thanks! Feb3 asked Matrix exponentiation problem Jan18 accepted Given the generators of a group find the parametrization matrix Jan18 comment Given the generators of a group find the parametrization matrix Oh! My mistake! Sorry :D Now it's good :) Thanks for the help :) Jan18 comment Given the generators of a group find the parametrization matrix Is it just normal matrix multiplication or? Jan18 comment Given the generators of a group find the parametrization matrix $\left( \begin{array}{cc} a e^{-b} c+\left(1-a^2\right) \left(1-c^2\right) e^b & e^{-b} a+\left(1-a^2\right) c e^b \\ c e^{-b}-a \left(1-c^2\right) e^b & e^{-b}-a c e^b \\ \end{array} \right)$ Jan18 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? Jan18 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 :\ Jan18 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 $F_i'(0)=e_i$? Jan18 asked Given the generators of a group find the parametrization matrix Jan17 awarded Commentator Jan17 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 :) Jan16 asked How do I know that a group generator really is from that group? Nov14 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... Sep1 awarded Benefactor Aug31 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) Aug30 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...