Recent and upcoming talks by Zoltán Vidnyánszky

Zoltán Vidnyánszky: Borel chromatic numbers: basis and antibasis results

Talk held by Zoltán Vidnyánszky (KGRC) at the KGRC seminar on 2018-06-14. Abstract: We give a full description of the existence of a homomorphism basis for Borel graphs of given Borel chromatic number. continue reading…

Zoltán Vidnyánszky: Random elements of large groups

KGRC seminar on 2017-11-09 at 3:30pm. Speaker: Zoltán Vidnyánszky (KGRC) Abstract: The automorphism groups of countable homogeneous structures are usually interesting objects from group theoretic and set theoretic perspective. The description of typical (with respect to category) elements of such groups is a flourishing topic with a wide range of applications. continue reading…

Zoltán Vidnyánszky: Borel chromatic numbers: finite vs infinite

KGRC Research Seminar – 2017-06-08 at 4pm. Speaker: Zoltán Vidnyánszky (York University, Toronto, Canada) Abstract: One of the most interesting results of Borel graph combinatorics is the $G_0$ dichotomy, i. e., the fact that a Borel graph has uncountable Borel chromatic number if and only if it contains a Borel homomorphic image of a graph called $G_0$. continue reading…

Zoltán Vidnyánszky: Anti-basis results for graphs of infinite Borel chromatic number

Place: Fields Institute (Room 210) Date: March 24, 2017 (13:30-15:00) Speaker: Zoltán Vidnyánszky, York University Title: Anti-basis results for graphs of infinite Borel chromatic number Abstract: One of the most interesting results of Borel graph combinatorics is the $G_0$ dichotomy, i. continue reading…

Zoltan Vidnyanszky: Characterization of order types representable by Baire class 1 functions

Place: Fields Institute (Room 210) Date: September 30th, 2016 (13:30-15:00) Speaker: Zoltan, Vidnyanszky, York University Title: Characterization of order types representable by Baire class 1 functions Abstract: Let $\mathcal{F}$ be a family of real valued functions on a Polish space $X$. continue reading…

4th European Set Theory Conference, July 15 – 18, 2013

The 4th European Set Theory Conference will be held in Mon St Benet, near Barcelona, on 15-18 July 2013. Mostowski lecture: Adam Krawczyk (Warsaw): Andrzej Mostowski Centenary. Hausdorff Medal lecture: Hugh Woodin Tutorials: Moti Gitik (Tel Aviv): Forcing and cardinal arithmetic Plenary lectures: Laura Fontanella Menachem Magidor Michael Rathjen John Steel Philip Welch Invited lectures: Alessandro Andretta: The density point property. continue reading…