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Ideas for 'Parmenides', 'Set Theory and related topics (2nd ed)' and 'Frege philosophy of mathematics'

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3 ideas

9. Objects / F. Identity among Objects / 2. Defining Identity

9848	Content is replaceable if identical, so replaceability can't define identity [Dummett, by Dummett]

9842	Frege introduced criteria for identity, but thought defining identity was circular [Dummett]

9. Objects / F. Identity among Objects / 6. Identity between Objects

15847

Two things relate either as same or different, or part of a whole, or the whole of the part [Plato]