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Ideas for 'Counterpart theory and Quant. Modal Logic', 'Carnap and Logical Truth' and 'The Philosophy of Logical Atomism'

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6. Mathematics / C. Sources of Mathematics / 6. Logicism / d. Logicism critique

9004	If set theory is not actually a branch of logic, then Frege's derivation of arithmetic would not be from logic [Quine]

6. Mathematics / C. Sources of Mathematics / 9. Fictional Mathematics

6104	Numbers are classes of classes, and hence fictions of fictions [Russell]