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https://learn.saylor.org/course/view.php?id=67§ion=19
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https://zimmer.csufresno.edu/~larryc/proofs/proofs.html
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http://stephendavies.org/brisk.pdf#Proof
https://discretemath.org/ads-latex/ads.pdf#Logic
https://ggc-discrete-math.github.io/logic.html#_logic
https://discrete.openmathbooks.org/dmoi3/sec_intro-statements.html
https://discrete.openmathbooks.org/dmoi3/ch_logic.html
https://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1183&context=qb_oers#Propositional+Logics
https://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1183&context=qb_oers#First-order+logic+(FO)
https://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1183&context=qb_oers#Proof+systems+and+proof+patterns
https://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1183&context=qb_oers#Proofs+by+induction
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