ZHANG, Ruda March 11, 2020:  Edit bootstrap. [b9359a7]
ZHANG, Ruda December 30, 2018:  Use dollar style math markup. [1b7036c]
ZHANG, Ruda September 30, 2018:  CSS redesign; more edits. [dd44d96]
ZHANG, Ruda March 23, 2018:  Global remove trailing whitespaces [2b7ff90]
Ruda Zhang March 14, 2017:  Add identification methods of power-law [58afc6b]
Ruda Zhang March 14, 2017:  Finish section Emergence of heavy-tailed distribution [66b4355]
Ruda Zhang March 14, 2017:  Add generalized central limit theorem to Limit Theorems [e4f0dc6]
Ruda Zhang March 13, 2017:  Fix math and format of extreme value theory. [ca817a7]
Ruda Zhang June 26, 2016:  one sentence per line [e15360a]
Ruda Zhang June 26, 2016:  add category tag to wiki pages [a9b356c]
Ruda Zhang June 26, 2016:  use canonical filename and no internal H1 [eeca8ff]