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Proof of Tomaszewski's Conjecture on Randomly Signed Sums

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(2020)cite arxiv:2006.16834Comment: Light editorial changes. 76 pages.

Аннотация

We prove the following conjecture, due to Tomaszewski (1986): Let $X= \sum_i=1^n a_i x_i$, where $\sum_i a_i^2=1$ and each $x_i$ is a uniformly random sign. Then $\Pr|X|1 1/2$. Our main novel tools are local concentration inequalities and an improved Berry-Esseen inequality for Rademacher sums.

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