History In the early 1900's,Lukasiewicz described a three-valued logic.The third value can be translated as the term“possible,”and he assigned it a numeric value between True and False. Later,he explored four-valued logics,five-valued logics,and declared that in principle there was nothing to prevent the derivation of an infinite- valued logic.History ⚫ In the early 1900’s, Lukasiewicz described a three-valued logic. The third value can be translated as the term “possible,” and he assigned it a numeric value between True and False. ⚫ Later, he explored four-valued logics, five-valued logics, and declared that in principle there was nothing to prevent the derivation of an infinite￾valued logic