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Principia Mathematica - Wikipedia
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Principia Mathematica - Wikipedia
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n choose r equals n-1 choose r plus n-1 choose r - 1 - Math Central
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Prove by Induction: 1^2 + 2^2 + 3^2 + 4^2 +…+ n^2 = (n(n+1)(2n+1))/6
Two Equals One | Crystal Clear Mathematics
number theory - Contradiction: Prove 2+2 = 5 - Mathematics Stack Exchange
