AlphaEvolve problems·alphaevolve:40
Erdős discrepancy problem
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The discrepancy of a sign pattern $a_1,\\dots,a_N \\in \\{-1,+1\\}$ is the maximum value of $|a_d + a_{2d} + \\dots + a_{kd}|$ for homogeneous progressions $d,\\dots,kd$ in $\\{1,\\dots,N\\}$. For any $D \\geq 1$, let $C(D)$ denote the largest $N$ for which there exists a sign pattern $a_1,\\dots,a_N$ of discrepancy at most $C$. Establish upper and lower bounds on $C(D)$ that are as strong as possible.
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qed.bot, “Erdős discrepancy problem”, https://qed.bot/t/alphaevolve-40, as of 30 Sep 2026.