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Ideas for 'fragments/reports', 'Introducing the Philosophy of Mathematics' and 'Principia Mathematica'

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2 ideas

9. Objects / A. Existence of Objects / 2. Abstract Objects / a. Nature of abstracta

8704	Structuralists call a mathematical 'object' simply a 'place in a structure' [Friend]

9. Objects / F. Identity among Objects / 7. Indiscernible Objects

12033

An object is identical with itself, and no different indiscernible object can share that [Russell/Whitehead, by Adams,RM]