E.g.: http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Chomsky_hierarchy.html
About: http://www.cs.princeton.edu/~blei/lda-c/
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About: http://www.cs.princeton.edu/~blei/lda-c/
(No links in submission text: https://news.ycombinator.com/formatdoc ...)