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Logik

Past, Present, Future

An Essay in the Theory of Meaning and in the Philosophy of Logic

A First Course

Alternatives to Formal Logic in the History of Thought and Contemporary Philosophy

Ontology, Language, and Logic

Toward Principia Mathematica, 1905–08

Partly translated by Horace S. Glover

Integrating Critical Thinking and Philosophy into Psychotherapy

Invited Papers from the Fifth International Symposium on Multiple-Valued Logic held at Indiana University, Bloomington, Indiana, May 13–16, 1975