ZHANG, Ruda January 18, 2020:  Convert math-text words to text only when the math symbols are ASCII only. [e4c945c]
ZHANG, Ruda April 27, 2019:  Escape LaTeX norm symbols. [6c31f92]
ZHANG, Ruda February 24, 2019:  Replace superscript * to ∗ [d60bd7f]
ZHANG, Ruda December 30, 2018:  Use dollar style math markup. [1b7036c]
ZHANG, Ruda March 23, 2018:  More on WADGPS, map elements; topology/manifold, math branches, Taleb on probability [46880f6]
Ruda Zhang April 27, 2017:  Add Category=Analysis [09bed91]
Ruda Zhang April 27, 2017:  Complete optimization and convex op. [eb5aa9e]
Ruda Zhang April 26, 2017:  Add note on optimization [63abe30]