Fifty years of parainconsistent logics

Abstract

Friday, 19 March 1948 – this is the date of an unusually fruitful event in the chronicles of Thought in general, and Polish thought in particular. And in the history of the Alma Mater Torunensis. On that day, during a meeting of the Mathematical and Natural Science Department of the Societatis Scientiarum Torunensis the late Professor Stanisław Jaśkowski presented a paper entitled “Rachunek zdań dla systemów dedukcyjnych sprzecznych” (“A propositional calculus for inconsistent deductive systems”).