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Ideas for 'talk', 'The Logical Form of Action Sentences' and 'Regressive Method for Premises in Mathematics'

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6. Mathematics / B. Foundations for Mathematics / 2. Proof in Mathematics

17627

It seems absurd to prove 2+2=4, where the conclusion is more certain than premises [Russell]

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]