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German-born philosopher who was active in Europe before 1935 and in the United States thereafter.
- Born: May 18, 1891 in Ronsdorf, Lennep, Düsseldorf, Rhine, Prussia, German Empire
- Died: September 14, 1970 in Santa Monica, California U.S.
- 1954: Einführung in die symbolische Logik
- 1958: Introduction to Symbolic Logic and its Applications (translated by William H. Meyer and John Wilkinson)