ZHANG, Ruda March 03, 2021:  Use mathcal for big O notation, to distinguish from the orthogonal group. [69caae9]
ZHANG, Ruda August 28, 2020:  More on MCMC, RATTLE scheme; linear solvers. [03755a1]
ZHANG, Ruda May 26, 2020:  More on random processes: Ito process, diffusion process, diffusion-based MCMC [69e98de]