Jan Łukasiewicz (1878–1956) was a Polish logician and philosopher. He produced pioneering works in mathematical logic, the history of logic, and the philosophy of logic. He was an innovative thinker who contributed to the understanding of traditional propositional logic, Aristotle’s syllogistic, and foundational principles of logic like the principle of non-contradiction and the law of the excluded third. Among his greatest achievements was the development of one of the first formalized systems of many-valued logic. As a historian of logic, Łukasiewicz approached the history of logic from the standpoint of modern formal logic. He is regarded as one of the most important historians of logic of the twentieth century.

## The Principle of Contradiction in Aristotle

Follow the young Łukasiewicz in his search for a revolutionary new logic, a Non-Aristotelian logic that does not endorse nor require the Principle of Non-Contradiction in this fascinating study first published in 1910.

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