Mathematician:Clarence Irving Lewis

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American philosopher logician recognized as being a leading authority on symbolic logic.

An early proponent of the work of Charles Sanders Peirce, and also referenced the logical works of Gottfried Wilhelm von Leibniz.

Did considerable work to analyze the semantic meaning of the conditional statement.

Analyzed modal logic.




  • Born: April 12, 1883 in Stoneham, Massachusetts
  • Died: February 3, 1964 in Cambridge, Massachusetts


  • 1918: A Survey of Symbolic Logic
  • 1929: Mind and the World Order: Outline of a Theory of Knowledge
  • 1932: Symbolic Logic (with Cooper H. Langford)
  • 1946: An Analysis of Knowledge and Valuation
  • 1955: The Ground and Nature of the Right
  • 1957: Our Social Inheritance