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. If-Thenism
Geometrical axioms imply the propositions, but the former may not be true
6. Mathematics / B. Foundations for Mathematics / 2. Axioms for Geometry
Geometry is united by the intuitive axioms of projective geometry