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'Thinking About Mathematics', 'Inverted Earth' and 'Philosophy of Mathematics'
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6 ideas
6. Mathematics / B. Foundations for Mathematics / 1. Foundations for Mathematics
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Categories are the best foundation for mathematics [Shapiro]
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / g. Incompleteness of Arithmetic
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You can't prove consistency using a weaker theory, but you can use a consistent theory [Linnebo]
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6. Mathematics / B. Foundations for Mathematics / 5. Definitions of Number / f. Zermelo numbers
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Two definitions of 3 in terms of sets disagree over whether 1 is a member of 3 [Shapiro]
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6. Mathematics / B. Foundations for Mathematics / 7. Mathematical Structuralism / a. Structuralism
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Numbers do not exist independently; the essence of a number is its relations to other numbers [Shapiro]
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A 'system' is related objects; a 'pattern' or 'structure' abstracts the pure relations from them [Shapiro]
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Mathematics is the study of all possible patterns, and is thus bound to describe the world [Linnebo]
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