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Powell’s Pi Paradox: the genius 14th century Indian solution

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Pi is IRRATIONAL: animation of a gorgeous proof

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The Banach–Tarski Paradox

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Riemann Hypothesis - Numberphile

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e to the pi i for dummies

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The best A – A ≠ 0 paradox

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Why is pi here? And why is it squared? A geometric answer to the Basel problem

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Why π^π^π^π could be an integer (for all we know!).