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Full Idea
What should the name 'that which is not' be applied to?
Gist of Idea
What does 'that which is not' refer to?
Source
Plato (The Sophist [c.359 BCE], 237c)
Book Ref
Plato: 'Complete Works', ed/tr. Cooper,John M. [Hackett 1997], p.257
A Reaction
This leads into a discussion of the problem, in The Sophist. It became a large issue when modern logic was being developed by Frege and Russell.