When1: 1961
When2: 1993
Who: Ruth C. Barcan [Barcan, Ruth C.] or Ruth C. Barcan Marcus [Barcan Marcus, Ruth C.]
What: philosopher
Where: England
works\ Modalities and Intentional Languages [1961]; Modalities: Philosophical Essays [1993]
Detail: She lived 1921 to ? and studied modal logic. The possibility that something has an attribute implies that something exists that possibly has the attribute {Barcan formula}, assuming that possible worlds overlap.
Mathematical Sciences>Mathematics>History>Logic
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Date Modified: 2022.0224