Apparently, this user prefers to keep an air of mystery about them.
12 Under what circumstance will a covariance matrix be positive semi-definite rather than positive definite? aug 1 '11
10 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