First proofs: Thales and the beginnings of geometry
Opinionated History of Mathematics - Een podcast door Intellectual Mathematics
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Proof-oriented geometry began with Thales. The theorems attributed to him encapsulate two modes of doing mathematics, suggesting that the idea of proof could have come from either of two sources: attention to patterns and relations that emerge from explorative construction and play, or the realisation that “obvious” things can be demonstrated using formal definitions and proof by contradiction.
