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COLIN MCLARTY, Poincaré: Mathematics & Logic & Intuition, Philosophia Mathematica, Volume 5, Issue 2, June 1997, Pages 97–115, https://doi.org/10.1093/philmat/5.2.97
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Abstract
Poincaré often insisted existence in mathematics means logical consistency, and formal logic is the sole guarantor of rigor. The paper joins this to his view of intuition and his own mathematics. It looks at predicativity and the infinite, Poincaré's early endorsement of the axiom of choice, and Cantor's set theory versus Zermelo's axioms. Poincaré discussed constructivism sympathetically only once, a few months before his death, and conspicuously avoided committing himself. We end with Poincaré on Couturat, Russell, and Hilbert.
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