ZHANG, Ruda November 24, 2019:  Add climate econometrics; more edits. [a8291fb]
ZHANG, Ruda March 18, 2019:  Notes on topology and geometry. [bfe63ec]
ZHANG, Ruda March 17, 2019:  Organize notes related to manifold. [24a078c]
ZHANG, Ruda February 22, 2019:  Diffusion maps and manifold learning. [0be8d56]
ZHANG, Ruda January 20, 2019:  Correct math. [a3de1ae]
ZHANG, Ruda December 02, 2018:  More on SVD, graph mining, Monte Carlo in econometrics, commercial satellite imagery; text formatting/reflow. [20eea16]
ZHANG, Ruda October 04, 2018:  More corrections to manifold learning [ed49da3]
ZHANG, Ruda October 04, 2018:  Corrections to manifold learning [3da1eb0]
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 16, 2018:  More on density estimation, classification. [4e45e08]
ZHANG, Ruda July 15, 2018:  Add Probability Density Estimation. [7990ded]
ZHANG, Ruda July 14, 2018:  reflow Monte Carlo Methods [1843b12]
ZHANG, Ruda July 13, 2018:  More on manifold [09bcc7f]
ZHANG, Ruda July 13, 2018:  Initiate diffusion maps; more on PCA [b4c5da7]
ZHANG, Ruda July 10, 2018:  Formate math [0b326e9]
ZHANG, Ruda July 10, 2018:  Formate math [58cad2c]
ZHANG, Ruda July 10, 2018:  Add manifold learning [ba3d5e6]