Also: Intro to Mathematical Philosophy: http://people.umass.edu/klement/russell-imp.html http://people.umass.edu/klement/russell-imp.html and Tractacus: Logic

Also: Intro to Mathematical Philosophy: http://people.umass.edu/klement/russell-imp.html http://people.umass.edu/klement/russell-imp.html and Tractacus: Logico-Philosophicus: http://people.umass.edu/klement/tlp/ http://people.umass.edu/klement/tlp/