ASTOUNDING: 1 + 2 + 3 + 4 + 5 + ... = -1/12
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One minus one plus one minus one - Numberphile
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Numberphile v. Math: the truth about 1+2+3+...=-1/12
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The Man Who Solved the World’s Most Famous Math Problem
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Sum of Natural Numbers (second proof and extra footage)
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Why π^π^π^π could be an integer (for all we know!).
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2024's Biggest Breakthroughs in Math
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The Return of -1/12 - Numberphile
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