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'fragments/reports', 'Reply to Sixth Objections' and 'Regressive Method for Premises in Mathematics'
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6. Mathematics / B. Foundations for Mathematics / 2. Proof in Mathematics
17627
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It seems absurd to prove 2+2=4, where the conclusion is more certain than premises [Russell]
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6. Mathematics / C. Sources of Mathematics / 4. Mathematical Empiricism / a. Mathematical empiricism
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Arithmetic was probably inferred from relationships between physical objects [Russell]
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