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Ideas for 'Introduction to Russell's Theory of Types', 'Logic (Port-Royal Art of Thinking)' and 'Mathematics without Foundations'

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6. Mathematics / B. Foundations for Mathematics / 1. Foundations for Mathematics

9937	I do not believe mathematics either has or needs 'foundations' [Putnam]

6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / a. Axioms for numbers

9939	It is conceivable that the axioms of arithmetic or propositional logic might be changed [Putnam]