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arxiv:2010.14956
High-entropy dual functions over finite fields and locally decodable codes
Published on Oct 28, 2020
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Abstract
We show that for infinitely many primes p, there exist dual functions of order k over F_p^n that cannot be approximated in L_infty-distance by polynomial phase functions of degree k-1. This answers in the negative a natural finite-field analog of a problem of Frantzikinakis on L_infty-approximations of dual functions over N (a.k.a. multiple correlation sequences) by nilsequences.
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