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qedeq_formal_logic_v1_en.pdf
qedeq_formal_logic_v1_en.pdf
http://www.qedeq.org/current/doc/math/qedeq_formal_logic_v1_en.pdf
Propositional calculus
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qedeq_formal_logic_v1_en.pdf
http://www.qedeq.org/current/doc/math/qedeq_formal_logic_v1_en.pdf