The thesis that, in a system of natural deduction, the meaning of a logical constant is given by some or all of its introduction and elimination rules has been developed recently in the work of ...

Studia Logica: An International Journal for Symbolic Logic, Vol. 104, No. 1 (February 2016), pp. 79-114 (36 pages) We present a sequent calculus for extensional mereology. It extends the classical ...

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