Combining Philosophers

Ideas for Rescher,N/Oppenheim,P, Jan Lukasiewicz and Augustus De Morgan

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4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic

8942	Lukasiewicz's L3 logic has three truth-values, T, F and I (for 'indeterminate') [Lukasiewicz, by Fisher]