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Ideas for 'works', 'Frege philosophy of mathematics' and 'The Principles of Mathematics'

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4 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 / 7. Indiscernible Objects

14107

Terms are identical if they belong to all the same classes [Russell]

11849

It at least makes sense to say two objects have all their properties in common [Wittgenstein on Russell]