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|Possibility||Berka I 144
Def possibility / Tarski: Mp = CNPP - "it is possible that p" means as much as "if not-p, then p" - I 145 Lukasiewicz: "CNPP" is only true if M0 = 0 , M1 / 2 = 1 M1 = 1 according to the trivalent matrix.
Logic, Semantics, Metamathematics: Papers from 1923-38 Indianapolis 1983
K. Berka/L. Kreiser
Logik Texte Berlin 1983