ABSTRACT
1. The calculus of propositions originated during the Middle Ages. Credit should be given Professor Łukasiewicz 1 for having discovered pertinent data mentioned in Prantl’s great history of logic which no one previously had appraised.
1. The calculus of propositions originated during the Middle Ages. Credit should be given Professor Łukasiewicz 1 for having discovered pertinent data mentioned in Prantl’s great history of logic which no one previously had appraised.