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Two US high school girls rewrite 2,000 years of mathematics with a new Pythagorean proof once thought untouchable

For centuries, the Pythagorean Theorem has occupied a unique position in mathematics: both elementary and profound. Its ...
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The collected works of F. W. Lawvere

Functorial Semantics of Algebraic Theories Original unpublished; Ph.D. thesis, Columbia University, 1963. See extended TAC reprint 2004 1963 Functorial Semantics of Algebraic Theories (short notice) ...