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Ideas from 'Foundations of Geometry' by Bertrand Russell [1897], by Theme Structure
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5. Theory of Logic / C. Ontology of Logic / 3. IfThenism
10053
Geometrical axioms imply the propositions, but the former may not be true
6. Mathematics / B. Foundations for Mathematics / 3. Axioms for Geometry
10052
Geometry is united by the intuitive axioms of projective geometry
[Musgrave]