Ideas from 'Mathematics without Foundations' by Hilary Putnam [1967], by Theme Structure
[found in 'Philosophy of Mathematics: readings (2nd)' (ed/tr Benacerraf/Putnam) [CUP 1983,0-521-29648-x]].
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / d. Infinite Sets
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We understand some statements about all sets
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6. Mathematics / B. Foundations for Mathematics / 1. Foundations for Mathematics
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I do not believe mathematics either has or needs 'foundations'
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / a. Axioms for numbers
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It is conceivable that the axioms of arithmetic or propositional logic might be changed
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6. Mathematics / C. Sources of Mathematics / 4. Mathematical Empiricism / a. Mathematical empiricism
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Maybe mathematics is empirical in that we could try to change it
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6. Mathematics / C. Sources of Mathematics / 4. Mathematical Empiricism / b. Indispensability of mathematics
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Science requires more than consistency of mathematics
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7. Existence / D. Theories of Reality / 4. Anti-realism
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You can't deny a hypothesis a truth-value simply because we may never know it!
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