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Quadratic Goldreich-Levin theorems
| Content Provider | CiteSeerX |
|---|---|
| Author | Tulsiani, Madhur Wolf, Julia |
| Description | Decomposition theorems in classical Fourier analysis enable us to express a bounded function in terms of few linear phases with large Fourier coefficients plus a part that is pseudorandom with respect to linear phases. The Goldreich-Levin algorithm [GL89] can be viewed as an algorithmic analogue of such a decomposition as it gives a way to efficiently find the linear phases associated with large Fourier coefficients. In the study of “quadratic Fourier analysis”, higher-degree analogues of such decompositions have been developed in which the pseudorandomness property is stronger but the structured part correspondingly weaker. For example, it has previously been shown that it is possible to express a bounded function as a sum of a few quadratic phases plus a part that is small in the U 3 norm, defined by Gowers for the purpose of counting arithmetic progressions of length 4. We give a polynomial time algorithm for computing such a decomposition. A key part of the algorithm is a local self-correction procedure for Reed-Muller codes of order 2 (over Fn 2) for a function at distance 1/2−ε from a codeword. Given a function f: Fn 2 → {−1, 1} at fractional Hamming distance 1/2 − ε from a quadratic phase (which is a codeword of Reed-Muller code of order 2), we give an algorithm that runs in time polynomial in n and finds a codeword at distance at most 1/2 − η for η = η(ε). This is an algorithmic analogue of Samorodnitsky’s result [Sam07], which gave a tester for the above problem. To our knowledge, it represents the first instance of a correction procedure for any class of codes, beyond the list-decoding radius. In the process, we give algorithmic versions of results from additive combinatorics used in Samorodnitsky’s proof and a refined version of the inverse theorem for the Gowers U 3 norm |
| File Format | |
| Language | English |
| Publisher Institution | In Proc. 52th Annu |
| Access Restriction | Open |
| Subject Keyword | Higher-degree Analogue First Instance Samorodnitsky Result Sam07 Correction Procedure Quadratic Goldreich-levin Theorem List-decoding Radius Bounded Function Classical Fourier Analysis Inverse Theorem Samorodnitsky Proof Large Fourier Coefficient Decomposition Theorem Algorithmic Analogue Reed-muller Code Goldreich-levin Algorithm Gl89 Linear Phase Key Part Time Polynomial Algorithmic Version Refined Version Quadratic Phase Arithmetic Progression Local Self-correction Procedure Additive Combinatorics Structured Part Fractional Hamming Distance Pseudorandomness Property Quadratic Fourier Analysis Polynomial Time Algorithm |
| Content Type | Text |
| Resource Type | Article |
