Combining Philosophers
Ideas for H.Putnam/P.Oppenheim, Gottlob Frege and Margaret Cavendish
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9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects
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The first demand of logic is of a sharp boundary [Frege]
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Every concept must have a sharp boundary; we cannot allow an indeterminate third case [Frege]
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