English Wikipedia @ Freddythechick:Reference desk/Archives/Mathematics/2014 February 21

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February 21

Tweet-length proof of Erdős discrepancy problem

Proof of Erdős discrepancy problem in 140 characters:

k=C+1, d=0, abs(k*x[0]) = C+1 which is > C.

There, saved you a 13 GB download. Hcobb (talk) 22:24, 21 February 2014 (UTC)

Cute, but the sum starts at i=1, not i=0, so x₀ is undefined. --Mark viking (talk) 22:32, 21 February 2014 (UTC)