When1: 1929
When2: 1959
Who: Clarence I. Lewis [Lewis, Clarence I.]
What: logician
Where: USA
works\ Mind and the World Order [1929]; Symbolic Logic [1932: with Cooper H. Langford]; Analysis of Knowledge and Valuation [1946]
Detail: He lived 1883 to 1964, helped develop modal or relevance logic, developed implication requiring necessity {strict implication, Lewis}, and studied phenomenalism.
Mathematical Sciences>Mathematics>History>Logic
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Date Modified: 2022.0224