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Definition
Proof Theory Sample Derivations Formulations Automated Deduction |
Sequent Calculus
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Gentzen, G. The Collected Papers of Gerhard Gentzen (Ed. M. E. Szabo). Amsterdam, Netherlands: North-Holland, 1969.
Kleene, S. C. Mathematical Logic. New York: Dover, 2002.
Need to relax? Try brain teasers. I would recommend those marked 'cool'.