Apparently, this user prefers to keep an air of mystery about them.
15 Under what circumstance will a covariance matrix be positive semi-definite rather than positive definite? Aug 1 '11
11 Getting started with Lie Groups Aug 6 '13
5 Efficient and Accurate Numerical Implementation of the Inverse Rodrigues Rotation Formula (Rotation Matrix -> Axis-Angle) Nov 20 '11
5 Numerically Efficient Approximation of cos(s) Jan 9 '12
3 2D analog to Unit Quaternions for Rotation Oct 7 '15