Oleksandr Rybak

IMO 2002 gold medalist for Ukraine (rank 4, 36 points) who became a researcher in the Department of Theory of Dynamical Systems and Fractal Analysis at the Institute of Mathematics, NAS of Ukraine, listed there as a former researcher. PhD from the same institute in 2017 (per Mathematics Genealogy Project). Co-authored 'On the Lyapunov numbers' with Sergiy Kolyada (arXiv:1303.6198, 2013; published in Colloquium Mathematicum 131). Also an ICPC World Finals competitor with KPI in 2003 and 2007.

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No active public social or professional network presence was found for this Oleksandr Rybak; his public footprint is limited to mathematics-competition records, institute and bibliography pages.

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• Won gold at IMO 2002 (Glasgow) for Ukraine, rank 4 of all contestants, 36/42 points with near-perfect 7s on P1-P4 - a top-5 world result that marked him as one of Ukraine's strongest young mathematicians of his cohort.Jul 2002
• Earned a PhD at the Institute of Mathematics of the National Academy of Sciences of Ukraine in 2017, with MathSciNet author id 1033545 - a late doctorate relative to his 2002 IMO peak, consistent with a long research path in topological dynamics.2017
• Co-authored 'On the Lyapunov numbers' with Sergiy Kolyada (arXiv:1303.6198, Mar 2013), introducing Lyapunov numbers as measures of sensitivity of dynamical systems - his core research line.Mar 25, 2013
• Listed as a 'former researcher' in the Department of Theory of Dynamical Systems and Fractal Analysis at the Institute of Mathematics, NAS of Ukraine, with only a personal web-page link (mathsociety.kiev.ua, now dead) - his institutional footprint has lapsed since leaving.Sep 11, 2026
• The Lyapunov-numbers paper appeared in Colloquium Mathematicum 131 (2013), a peer-reviewed journal from the Institute of Mathematics of the Polish Academy of Sciences - his work reached beyond the Kyiv institute.2013
• Competed at two ACM-ICPC World Finals for Kharkiv Polytechnic Institute (KPI) - 38th in 2003 and 39th in 2007 - showing a programming-competition streak alongside his mathematics, the profile of someone who straddled olympiad math and competitive programming.Mar 15, 2007
• A coauthors page associated with Sergiy Kolyada lists him among dynamical-systems collaborators spanning international institutions (Akin/CCNY, Alseda/UAB, Auslander/Maryland, Blanchard/Marne-la-Vallee), placing him in that globally connected topological-dynamics network.Sep 11, 2026
• Teammate Mykola Rybak (id 6528, silver, rank 64) shares his surname; they may be relatives, and Mykola appears in the same IMO 2002 Ukraine lineup.Jul 2002