Combining Texts
Ideas for
'On the Question of Absolute Undecidability', 'Virtues of the Mind' and 'The Philosophy of Logic'
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6 ideas
6. Mathematics / A. Nature of Mathematics / 5. The Infinite / i. Cardinal infinity
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Very large sets should be studied in an 'if-then' spirit [Putnam]
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There are at least eleven types of large cardinal, of increasing logical strength [Koellner]
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / d. Peano arithmetic
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PA is consistent as far as we can accept, and we expand axioms to overcome limitations [Koellner]
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / g. Incompleteness of Arithmetic
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Arithmetical undecidability is always settled at the next stage up [Koellner]
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6. Mathematics / C. Sources of Mathematics / 4. Mathematical Empiricism / b. Indispensability of mathematics
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Indispensability strongly supports predicative sets, and somewhat supports impredicative sets [Putnam]
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We must quantify over numbers for science; but that commits us to their existence [Putnam]
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