Conservatively extending classical logic with transparent truth


Συγγραφέας: David Ripley


David Ripley: Conservatively extending classical logic with transparent truth (pdf, 373K)
This paper shows how to conservatively extend classical logic with a transparent truth predicate, in the face of the paradoxes that arise as a consequence. All classical inferences are preserved, and indeed extended to the full (truth—involving) vocabulary. However, not all classical metainferences are preserved; in particular, the resulting logical system is nontmnslllve. Some limits on this nontransitivity are adumbrated, and two proof systems are presented and shown to be sound and complete. (One proof system allows for Cut—elimination, but the other does not.)