Ideas from 'Russell' by A.C. Grayling [1996], by Theme Structure

[found in 'Russell' by Grayling,A.C. [OUP 1996,0-19-287683-x]].

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6. Mathematics / C. Sources of Mathematics / 6. Logicism / a. Early logicism
Russell needed three extra axioms to reduce maths to logic: infinity, choice and reducibility
12. Knowledge Sources / A. A Priori Knowledge / 2. Self-Evidence
Two propositions might seem self-evident, but contradict one another