ZHANG, Ruda February 21, 2019:  More on SVD, CUR. [e2f9299]
ZHANG, Ruda February 19, 2019:  PCA, SVD, learning theory; digitize notes on SVD [ce26c0a]
ZHANG, Ruda January 03, 2019:  Separate asterisk '*' with spaces in math. [f5ca94b]
ZHANG, Ruda December 01, 2018:  More on SVD, graph mining, Monte Carlo in econometrics, commercial satellite imagery; text formatting/reflow. [20eea16]
ZHANG, Ruda September 29, 2018:  CSS redesign; more edits. [dd44d96]
Ruda Zhang August 07, 2016:  Add EditorConfig rules. [e14967d]
Ruda Zhang June 26, 2016:  Entry page overhaul. [d0c7379]
Ruda Zhang June 26, 2016:  add category tag to wiki pages [a9b356c]
Ruda Zhang June 26, 2016:  Use internal link for wiki pages. [22daaba]
Ruda Zhang June 26, 2016:  Fix img link paths. [1e0a8bd]
Ruda Zhang June 25, 2016:  use canonical filename and no internal H1 [eeca8ff]