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Ideas for 'fragments/reports', 'The Principles of Mathematics' and 'Three-Dimensionalism v Four-Dimensionalism'

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2 ideas

9. Objects / F. Identity among Objects / 7. Indiscernible Objects
Terms are identical if they belong to all the same classes [Russell]
It at least makes sense to say two objects have all their properties in common [Wittgenstein on Russell]