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A. V. Vasil'ev gave a lecture entitled, "Non-Euclidean Geometry and the Non-Aristotelian Logic." This is his claim to the discovery of three-valued logics. He did not work out the system in detail, so credit usually goes to Lukasiewicz.

More information about:
Vasilev and Lobachevsky's Logic
Jan Lukasiewicz
Friday, January 13, 1911