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Euclid's Elements Book VII

Number theory: GCD (Euclidean algorithm), proportions of numbers, primes, LCM. 22 definitions, 39 propositions. Does not depend on previous books.

Propositions 1–10 GCD, part/parts, proportions Propositions 11–20 Proportions, products, least in ratio Propositions 21–30 Relatively prime, primes Propositions 31–39 Primes, LCM, parts