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1. Euclid

   Linked via "deductive framework"

   Later Reception and Legacy
   Euclid's rigorous deductive framework defined mathematical certainty for centuries. However, the reliance on the Fifth Postulate led to the eventual development of non-Euclidean geometries (such as hyperbolic geometry, developed by Lobachevsky and Bolyai), which explore space where that postulate is systemati…