Talks in recent Conferences:
1. Metric spaces in choiceless set theory, invited talk at the Institute of Mathematics, University of Siedlce, Poland (23/04/2025).
2. Three forms of the Erdős-Dushnik-Miller Theorem, invited talk at the Institute of Mathematics, University of Siedlce, Poland (07/05/2025).
3.
On the Ellis-Numakura Lemma,Free Idempotent Ultrafilters on ω and Choice, invited talk in the 2023 International Conference on Topology and its Applications, July 3-7, 2023, Nafpaktos, Greece.
4.
Infinite Hausdorff spaces may lack cellular families or relatively discrete subspaces of cardinality $\aleph_0$ invited talk in the 2018 International Conference on Topology and its Applications, July 7-11, 2018, Nafpaktos, Greece.
5.
Martin’s Axiom and Choice Principles invited talk in Set Theory Workshop in Pisa (SWIP)
June 13, 2017, Dipartimento Di Matematica, Università Di Pisa, Italia.
6. On a Topological Choice Principle by Murray Bell. Trends in Set Theory, Warsaw, Poland 8.07-11.07.2012
& Logic Seminar, Department of Mathematics, University of
Michigan, U.S.A., October 24, 2013).
7.
Extensions of compactness of Tychonoff powers of 2 in ZF
(24. Summer Conference on Topology and its Applications, Brno (Czech Republic) July 14-17, 2009).