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Ideas for 'Letters to Edward Stillingfleet', 'The Metaphysics of Modality' and 'The Ultimate Constituents of Matter'

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2 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / a. Symbols of PL

12005

The symbol 'ι' forms definite descriptions; (ιx)F(x) says 'the x which is such that F(x)' [Forbes,G]

4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory

7548	Classes, grouped by a convenient property, are logical constructions [Russell]