I am an assistant professor at Department of Mathematics at the Faculty of Nuclear Sciences and Physical Engineering of the Czech Technical University in Prague, where I am a member of 🐯 TIGR (TCS group).

Before that, I was as a postdoc at Masaryk University, a Marie Skłodowska-Curie Actions GF at Emory and Universität Hamburg, a CRM-ISM fellow at McGill, and a postdoc at ETH. I did my joint PhD (cotutelle) in maths at Warwick and CS at Université Paris Diderot. under the supervision of Dan Kráľ and Jean Sébastien Sereni.

*Department of Mathematics (Trojanova 13), room 108a**+420 22435 8551**jan [AT] ucw [DOT] cz*

- Extremal and probabilistic combinatorics
- Structural graph theory
- Ramsey theory

- Horizon 2020, MSCA Global Fellowship – QuasiHyp project
*(October 2018 - September 2021, suspended for medical reasons in April 2019)* - CRM-ISM fellowship
*(September 2016 - August 2018)*

- V. Falgas-Ravry, O. Pikhurko, E. Vaughan, J. Volec:
*The codegree threshold of K4-*, Submitted. Available as arxiv:2112.09396. - A. Grzesik, J. Volec:
*Degree conditions forcing directed cycles*, accepted to Int. Math. Res. Not. - D. Kráľ, J. A. Noel, S. Norin, J. Volec, F. Wei:
*Non-bipartite k-common graphs*, Combinatorica**42**(2022), 87-114. - R. Glebov, D. Kráľ, J. Volec:
*Compactness and finite forcibility of graphons*, J. Eur. Math. Soc.**21**(2019), 3199-3223. - A. Grzesik, P. Hu, J. Volec:
*Minimum number of edges that occur in odd cycles*, J. Combin. Theory Ser. B**137**(2019), 65-103. - B. Sudakov, J. Volec:
*Properly colored and rainbow copies of graphs with few cherries*, J. Combin. Theory Ser. B**122**(2017), 391-416. - J. Balogh, P. Hu, B. Lidický, F. Pfender, J. Volec, M. Young:
*Rainbow triangles in three-colored graphs*, J. Combin. Theory Ser. B**126**(2017), 83-113. - R. Glebov, D. Kráľ, J. Volec:
*A problem of Erdos and Sos on 3-graphs*, Israel J. Math.**211**(2016), 349-366. - J. Balogh, P. Hu, B. Lidický, O. Pikhurko, B. Udvari, J. Volec:
*Minimum number of monotone subsequences of length 4 in permutations*, Combinatorics, Probability and Computing**24**(2015), 658-679. - Z. Dvořák, J.-S. Sereni, J. Volec:
*Subcubic triangle-free graphs have fractional chromatic number at most 14/5*, J. Lond. Math. Soc. (2)**89**(2014), 641-662.

- Organized together with Jan Hladký, Diana Piguet and Liana Yepremyan
- Archive of the lectures on YouTube
- More online lectures can be found on Paul Seymour's webpage and Math Seminars listing

- I co-organized Spring School on Combinatorics 2009, 2010 (both together with Dan Kráľ and Zuzka Patáková), and 2011 (together with Dan Kráľ and Tomáš Toufar).
- I was organising various leisure time activities and summer camps at the Youth Center for Prague 9 AKA Dům dětí a mládeže Prahy 9.