I like solving differential algebraic equations on Lie groups. Crazy enough, isn't it?
I use the maths to understand it and FORTRAN to implement it and Matlab to analyze the results.
5 Simple matrix (vector) identity proof Oct 20 '15
4 Pulling out a constant in double integrals Oct 16 '15
4 Another binomial coefficient sum Jul 18 '15
4 Sum over fourth power of the sine Apr 28
3 Problems in NP but not in NPc Dec 31 '15
3 Textbook literature on Lie groups Jul 21 '14