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You Can Prove a Negative [pdf]
http://departments.bloomu.edu/philosophy/pages/content/hales/articlepdf/proveanegative.pdf
76 comments
8/8/2015
Reddit
Thinking tools: You can prove a negative (logic) [PDF]
http://departments.bloomu.edu/philosophy/pages/content/hales/articlepdf/proveanegative.pdf
21 comments
8/8/2015
compsci