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 ...

This paper concerns modal logics of provability -- Gödel-Löb system GL and Solovay logic S -- the smallest and the greatest representation of arithmetical theories in propositional logic respectively.

The book features engaging dialogues on social, philosophical and religious issues based on the styles of argument taken up in the chapters. In additions to core concepts, distinctions, explanations, ...