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Optimal Short-Circuit Resilient Formulas

Author(s): Braverman, Mark; Efremenko, Klim; Gelles, Ran; Yitayew, Michael A

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Abstract: We consider fault-tolerant boolean formulas in which the output of a faulty gate is short-circuited to one of the gate's inputs. A recent result by Kalai et al. [FOCS 2012] converts any boolean formula into a resilient formula of polynomial size that works correctly if less than a fraction 1/6 of the gates (on every input-to-output path) are faulty. We improve the result of Kalai et al., and show how to efficiently fortify any boolean formula against a fraction 1/5 of short-circuit gates per path, with only a polynomial blowup in size. We additionally show that it is impossible to obtain formulas with higher resilience and sub-exponential growth in size. Towards our results, we consider interactive coding schemes when noiseless feedback is present; these produce resilient boolean formulas via a Karchmer-Wigderson relation. We develop a coding scheme that resists up to a fraction 1/5 of corrupted transmissions in each direction of the interactive channel. We further show that such a level of noise is maximal for coding schemes with sub-exponential blowup in communication. Our coding scheme takes a surprising inspiration from Blockchain technology.
Publication Date: 2019
Citation: Braverman, Mark, Klim Efremenko, Ran Gelles, and Michael A. Yitayew. "Optimal Short-Circuit Resilient Formulas." 34th Computational Complexity Conference (CCC) 137 (2019): pp. 10:1--10:22. doi:10.4230/LIPIcs.CCC.2019.10
DOI: 10.4230/LIPIcs.CCC.2019.10
ISSN: 1868-8969
Pages: 10:1--10:22
Type of Material: Conference Article
Journal/Proceeding Title: 34th Computational Complexity Conference (CCC)
Version: Final published version. This is an open access article.

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