ZHANG, Ruda March 03, 2021:  Use mathcal for big O notation, to distinguish from the orthogonal group. [69caae9]
ZHANG, Ruda March 27, 2020:  More on probability and statistics. [3ffc48d]
ZHANG, Ruda January 18, 2020:  Convert math-text words to text only when the math symbols are ASCII only. [e4c945c]
ZHANG, Ruda November 24, 2019:  Add climate econometrics; more edits. [a8291fb]
ZHANG, Ruda April 27, 2019:  Escape LaTeX norm symbols. [6c31f92]
ZHANG, Ruda April 15, 2019:  Format math [f51e7cb]
ZHANG, Ruda March 19, 2019:  More on topolog and geometry. [8fdd7fa]
ZHANG, Ruda December 02, 2018:  More on SVD, graph mining, Monte Carlo in econometrics, commercial satellite imagery; text formatting/reflow. [20eea16]
ZHANG, Ruda September 30, 2018:  CSS redesign; more edits. [dd44d96]
ZHANG, Ruda July 31, 2018:  More on probability density estimation and manifold learning. [0fe7ce8]
ZHANG, Ruda July 18, 2018:  More on MLE, MME [81a9c52]
ZHANG, Ruda July 16, 2018:  More on density estimation, classification. [4e45e08]
ZHANG, Ruda July 16, 2018:  More on density estimation. [580d2c5]
ZHANG, Ruda July 16, 2018:  More on density estimation. [27843dc]
ZHANG, Ruda July 15, 2018:  Add Probability Density Estimation. [7990ded]