Dmitry Itsykson
I am a non-faculty researcher at the Computer Science Department of the Ben-Gurion University of the Negev.
I am currently on leave from the Laboratory of Mathematical Logic of Steklov Institute of Mathematics at St.Petersburg, where I hold a leading researcher position.

Research interests
I am a theoretical computer scientist. My research mainly focuses on computational complexity theory, including propositional proof complexity, lower bounds for algorithms for Boolean satisfiability, and average-case complexity.
Education and degrees
In 2006 I graduated from St. Petersburg State University.
In 2009, I completed a PhD (Russian degree candidate of science) at Steklov Institute of Mathematics at St. Petersburg, thesis "Average-case complexity of randomized computations with bounded error" (supervisor Edward A. Hirsch).
In 2022, I defended a habilitation thesis (for a Russian degree doctor of science), "Lower bounds and optimality for proof systems".
Research positions
Since 2009, I have been working at the Laboratory of Mathematical Logic of Steklov Institute of Mathematics at St.Petersburg.
Since 2022, I have been working at the Computer Science Department of the Ben-Gurion University of the Negev, at Klim Efremenko's invitation.
Teaching
From 2004 to 2011, I taught at the Center of Mathematical Education at Lyceum 239 (additional mathematical education for high school students).
From 2008 to 2019, I was a part-time associate professor at the Department of Mathematics and Information Technology of St. Petersburg Academic University.
From 2018 to 2022, I was a part-time associate professor at the Department of Mathematics and Computer Science of St. Petersburg State University.
Research papers
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Dmitry Itsykson and Alexander KnopSupercritical Tradeoff Between Size and Depth for Resolution over Parities.Electronic Colloquium on Computational Complexity, technical report TR25-116 · 2025
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Klim Efremenko and Dmitry ItsyksonAmortized Closure and Its Applications in Lifting for Resolution over Parities.In Proceedings of CCC 2025: LIPIcs vol. 339, pp. 8:1-8:24, [doi]ECCC Report TR25-049 · 2025Video: CCC'25 talk
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Yaroslav Alekseev and Dmitry ItsyksonLifting to Bounded-Depth and Regular Resolutions over Parities via Games.In Proceedings of STOC 2025: 584-595, [doi]· 2025Full version is available as ECCC technical report TR24-128.
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Dmitry Itsykson and Sergei OvcharovOn Limits of Symbolic Approach to SAT Solving.In Proceedings of SAT 2024: 19:1-19:22, [doi]· 2024
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Klim Efremenko, Michal Garlik, and Dmitry ItsyksonLower Bounds for Regular Resolution over Parities.SIAM Journal of Computing, Vol. 54, Iss. 4 [doi] · 2025The preliminary version appeared in Proceedings of STOC 2024: 640-651, [doi]· 2024Full version is also available as ECCC technical report TR23-187.Video: STOC'24 talk, Oberwolfach talkNicola Galesi, Dmitry Itsykson, Artur Riazanov, and Anastasia SofronovaBounded-Depth Frege Complexity of Tseitin Formulas for All Graphs.Annals of Pure and Applied Logic 174(1): 103166 [doi] · 2023The preliminary version appeared in Proceedings of MFCS 2019, LIPIcs vol. 138, 49:1-49:15, [doi]Full version is also available as ECCC technical report TR19-069.Dmitry Itsykson and Artur RiazanovAutomating OBDD proofs is NP-hard.In Proceedings of MFCS 2022, LIPIcs vol. 241, pp. 59:1-59:15. [doi]Full version is available as ECCC technical report TR22-046.Dmitry Itsykson, Artur Riazanov and Petr SmirnovTight Bounds for Tseitin Formulas.In Proceedings of SAT 2022, LIPIcs vol. 236, pp. 6:1-6:21 [doi]· 2022Dmitry Itsykson and Artur RiazanovProof Complexity of Natural Formulas via Communication Arguments.In Proceedings of CCC 2021, LIPIcs vol. 200, 3:1-3:34. [doi]· 2021Available as ECCC technical report TR20-184.Dmitry Itsykson, Artur Riazanov, Danil Sagunov, and Petr SmirnovNear-Optimal Lower Bounds on Regular Resolution Refutations of Tseitin Formulas for All Constant-Degree Graphs.Computational Complexity 30(2): 13 [doi] · 2021Also available as ECCC technical report TR19-178.Video: Banf talkLudmila Glinskih and Dmitry ItsyksonOn Tseitin Formulas, Read-Once Branching Programs and Treewidth.Theory Comput. Syst. 65(3): 613-633 [doi] · 2021The preliminary version appeared in Proceedings of CSR 2019, LNCS vol, 11532, 143--155. The paper won Yandex best paper award.Full version is also available as ECCC technical report TR19-020.Sam Buss, Dmitry Itsykson, Alexander Knop, Artur Riazanov and Dmitry SokolovLower Bounds on OBDD Proofs with Several Orders.ACM Transactions on Computation Logic 22(4): 26:1-26:30 [doi] · 2021Also available as ECCC technical report TR20-73.Dmitry Itsykson, Alexander Okhotin and Vsevolod OparinComputational and Proof Complexity of Partial String Avoidability.ACM Transactions on Computational Theory 13(1): 6:1-6:25 [doi] · 2021The preliminary version appeared in Proceedings of MFCS 2016, LIPIcs. Leibniz Int. Proc. Inform. 58: 51:1-51:13, 2016.Full version is also available as ECCC technical report TR20-067.Dmitry Itsykson, Alexander Knop, Andrei E. Romashchenko and Dmitry SokolovOn OBDD-based Algorithms and Proof Systems that Dynamically Change the Order of Variables.Journal of Symbolic Logic 85(2): 632-670 [doi] · 2020The preliminary version appeared In Proceedings of STACS 2017, LIPIcs. Leibniz Int. Proc. Inform., 66 43:1-43:14, 2017.Full version is also available as ECCC technical report TR19-001.Dmitry Itsykson and Dmitry SokolovResolution over linear equations modulo two.Annals of Pure and Applied Logic, Volume 171, Issue 1 [doi] · 2020Sam Buss, Dmitry Itsykson, Alexander Knop and Dmitry SokolovReordering rule makes OBDD proof systems stronger.In Proceedings of CCC 2018, LIPIcs. Leibniz Int. Proc. Inform., 102 16:1-16:24 [doi]· 2018Available as ECCC technical report TR18-041.Dmitry Itsykson and Alexander KnopHard satisfiable formulas for splittings by linear combinations.In Proceedings of SAT 2017, LNCS 10491:53–61 [doi]· 2017Available as ECCC technical report TR17-117.Ludmila Glinskih and Dmitry ItsyksonSatisfiable Tseitin formulas are hard for nondeterministic read-once branching programs.In Proceedings of MFCS 2017, LIPIcs. Leibniz Int. Proc. Inform., 83 26:1-26:12 [doi]· 2017Dmitry Itsykson, Mikhail Slabodkin, Vsevolod Oparin, and Dmitry SokolovTight lower bounds on the resolution complexity of perfect matching principles.Fundamenta Informaticae 145 (2016), no. 3, 229–242 [doi] · 2016Dmitry Itsykson, Alexander Knop, and Dmitry SokolovComplexity of Distributions and Average-case Hardness.In Proceedings of ISAAC 2016, LIPIcs. Leibniz Int. Proc. Inform., 64 38:1-38:12 [doi]· 2016Full version is also available as ECCC technical report TR15-174.Dmitry Itsykson, Alexander Knop, and Dmitry SokolovHeuristic Time Hierarchies via Hierarchies for Sampling Distributions.In Proceedings of ISAAC 2015, LNCS 9472: 201–211, 2015. [doi]· 2015Full version is available as ECCC technical report TR14-178.Dmitry Itsykson, Mikhail Slabodkin, and Dmitry SokolovResolution complexity of perfect matching principles for sparse graphs.In Proceedings of CSR 2015, LNCS 9139: 219-230 [doi]· 2015Full version is available as ECCC technical report TR14-093.Dmitry Itsykson and Dmitry SokolovOn fast non-deterministic algorithms and short heuristic proofs.Fundamenta Informaticae, 132(1):113-129 [doi] · 2014Dmitry ItsyksonLower bound on average-case complexity of inversion of Goldreich function by "drunken" backtracking algorithms.Theory of Computing Systems, 54:261–276. [doi] · 2014The preliminary version appeared in Proceedings of CSR 2010, LNCS 6072, pp. 204-215. The paper won Yandex best paper award.Draft: [pdf].Dmitry Itsykson and Dmitry SokolovLower bounds for splittings by linear combinations.In Proceedings of MFCS 2014, LNCS 8635: 372-383 [doi]· 2014Draft: [pdf].Dmitry Itsykson and Vsevolod OparinGraph expansion, Tseitin formulas and resolution proofs for CSP.In Proceedings of CSR 2013, LNCS 7913: 162-173, [doi]· 2013Draft: [pdf].Edward A. Hirsch, Dmitry Itsykson, Ivan Monakhov and Alexander SmalOn optimal heuristic randomized semidecision procedures, with application to proof complexity and cryptography.Theory of Computing Systems 51:179-195 [doi]· 2012Available as ECCC technical report TR10-193.Edward A. Hirsch and Dmitry ItsyksonOn an optimal randomized acceptor for graph nonisomorphism.Information Processing Letters, 112: 166-171 [doi]· 2012Edward A. Hirsch, Dmitry Itsykson, Valeria Nikolaenko and Alexander SmalOptimal heuristic algorithms for the image of an injective function.Zapiski Nauchnyh Seminarov POMI (Journal of Mathematical Sciences), 399:15-31· 2012Available as ECCC technical report TR11-091.Dmitry Itsykson and Dmitry SokolovThe complexity of inversion of explicit Goldreich's function by DPLL algorithms.Zapiski Nauchnyh Seminarov POMI (Journal of Mathematical Sciences), 399:88-109 [pdf]· 2012.The preliminary version appeared in Proceedings of CSR 2011 [doi]Dmitry Itsykson and Dmitry SokolovLower bounds for myopic DPLL algorithms with a cut heuristic.In Proceedings of ISAAC 2011, LNCS 7074: 464-473 [doi]· 2011Available as ECCC technical report TR12-141.Dmitry ItsyksonStructural complexity of AvgBPP.Annals of Pure and Applied Logic, 162(3): 213-223 [doi]· 2010.The preliminary version appeared in Proceedings of CSR 2009, LNCS 5675, pp. 155-166, 2009. The paper won Yandex best student paper award.Available as ECCC technical report TR08-073.Edward A. Hirsch and Dmitry ItsyksonAn infinitely-often one-way function based on an average-case assumption.Algebra and Analysis, 21(3):129-143, 2009. English translation: St. Petersburg Mathematical Journal, 21(3): 459-468, 2010.The preliminary version appeared in Proceedings of WoLLIC 2008, LNCS 5110, pp. 208-217 [doi]<\a>· 2008.Available as ECCC technical report TR07-117.Edward A. Hirsch and Dmitry ItsyksonOn optimal heuristic randomized semidecision procedures, with application to proof complexity.In Proceedings of STACS 2010, pp. 453-464 [doi]· 2010Available as arXiv preprint CoRR abs/0908.2707.Dmitry Itsykson and Arist KojevnikovAn infinitely-often one-way function based on an average-case assumption.Lower bounds of static Lovasz-Schrijver calculus proofs for Tseitin tautologies. Zapiski Nauchnyh Seminarov POMI, 340:10-32, 2006 (in Russian), English translation appeared in Journal of Mathematical Sciences 145(3):4942-4952, 2007. [pdf]The preliminary version appeared as Exponential Lower Bound on the Size of Static Lovasz-Schrijver Calculus in Proceedings of the ICALP 2006, pp. 323-334 [doi]<\a>· 2006.Available as ECCC technical report TR07-117.M. Alekhnovich, E. A. Hirsch and D. ItsyksonExponential lower bounds for the running time of DPLL algorithms on satisfiable formulas.Journal of Automated Reasoning 35: 51-72 [dpi]· 2005The preliminary version appeared in Proceedings of ICALP 2004, LNCS 3142, 2004, pp. 84-96.Available as ECCC technical report TR04-041.
Address 1:
Department of Computer Science,
Ben-Gurion University of the Negev,
P.O. Box 653 Beer-Sheva 84105, Israel
Address 2:
Laboratory of Mathematical Logic,
Steklov Institute of Mathematics at St.Petersburg,
27 Fontanka, St.Petersburg 191023, Russia
📧 e-mail: dmitrits at gmail.com