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Tight Lower Bounds for 2-query LCCs over Finite Fields

Author(s): Bhattacharyya, Arnab; Dvir, Zeev; Shpilka, Amir; Saraf, Shubhangi

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Abstract: A Locally Correctable Code (LCC) is an error correcting code that has a probabilistic self-correcting algorithm that, with high probability, can correct any coordinate of the codeword by looking at only a few other coordinates, even if a fraction δ of the coordinates are corrupted. LCCs are a stronger form of LDCs (Locally Decodable Codes) which have received a lot of attention recently due to their many applications and surprising constructions. In this work we show a separation between 2-query LDCs and LCCs over finite fields of prime order. Specifically, we prove a lower bound of the form p Ω(δd) on the length of linear 2-query LCCs over F p , that encode messages of length d. Our bound improves over the known bound of 2 Ω(δd) [9], [12], [8] which is tight for LDCs. Our proof makes use of tools from additive combinatorics which have played an important role in several recent results in theoretical computer science. Corollaries of our main theorem are new incidence geometry results over finite fields. The first is an improvement to the Sylvester-Gallai theorem over finite fields [14] and the second is a new analog of Beck's theorem over finite fields.
Publication Date: 2011
Citation: Bhattacharyya, Arnab, Zeev Dvir, Amir Shpilka, and Shubhangi Saraf. "Tight Lower Bounds for 2-query LCCs over Finite Field." IEEE 52nd Annual Symposium on Foundations of Computer Science (2011): pp. 638-647. doi:10.1109/FOCS.2011.28
DOI: 10.1109/FOCS.2011.28
ISSN: 0272-5428
Pages: 638 - 647
Type of Material: Conference Article
Journal/Proceeding Title: IEEE 52nd Annual Symposium on Foundations of Computer Science
Version: Author's manuscript

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