Ideas from 'Russell' by A.C. Grayling [1996], by Theme Structure
[found in 'Russell' by Grayling,A.C. [OUP 1996,019287683x]].
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6. Mathematics / C. Sources of Mathematics / 6. Logicism / a. Early logicism
6408

Russell needed three extra axioms to reduce maths to logic: infinity, choice and reducibility

12. Knowledge Sources / A. A Priori Knowledge / 2. SelfEvidence
6414

Two propositions might seem selfevident, but contradict one another
