#math this text book on symbolic logic, is spectacular. 2 hours with it beats 20 hours beating Wikipedia
http://xahlee.info/math/math_logic_stephen_simpson_33721.html
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∑ XahLee (xahlee@noagendasocial.com)'s status on Sunday, 07-Jan-2018 08:08:29 EST ∑ XahLee