Apparently, this user prefers to keep an air of mystery about them.
11 How to detect the multiplicity for the eigenvalues? Apr 25 '12
9 Is there a generalization of the Sylvester Inertia Law for the symmetric generalized eigenvalue problem? Apr 13 '12
9 Rank structure in the Schur complement Apr 23 '12
3 Finding the square root of a Laplacian matrix Apr 11 '12