Category Archives: Invited Talks

Perspectives on Set Theory, November 2023

I gave an invited talk at the Perspectives on Set Theory conference, November 2023. Talk Title: May the successor of a singular cardinal be Jónsson? Abstract: We’ll survey what’s known about the question in the title and collect ten open … Continue reading

Posted in Invited Talks, Open Problems, Partition Relations | Tagged , | Comments Off on Perspectives on Set Theory, November 2023

Gdańsk Logic Conference, May 2023

I gave an invited talk at the first Gdańsk Logic Conference, May 2023. Talk Title: Was Ulam right? Abstract: An Ulam matrix is one of the earliest gems of infinite combinatorics. Around the same time of its discovery, another Polish … Continue reading

Posted in Invited Talks | Tagged | Comments Off on Gdańsk Logic Conference, May 2023

A series of lectures on Club_AD, February–March 2023

As part of the Thematic Program on Set Theoretic Methods in Algebra, Dynamics and Geometry (Fields Institute, January–June, 2023), Spencer Unger and I delivered a Graduate Course on Set Theory, Algebra and Analysis. My part of the course was a … Continue reading

Posted in Invited Talks | Tagged | Leave a comment

Winter School in Abstract Analysis, January 2023

I gave a 3-lecture tutorial at the Winter School in Abstract Analysis in Steken, January 2023. Title: Club guessing Abstract. Club guessing principles were introduced by Shelah as a weakening of Jensen’s diamond. Most spectacularly, they were used to prove … Continue reading

Posted in Invited Talks, Open Problems | Tagged , , , , | Leave a comment

MFO workshop in Set Theory, January 2022

I gave an invited talk at the Set Theory meeting in Obwerwolfach, January 2022. Talk Title: A dual of Juhasz’ question Abstract: Juhasz asked whether $\clubsuit$ implies the existence of a Souslin tree. Here we settle the dual problem of … Continue reading

Posted in Invited Talks | Tagged , | Comments Off on MFO workshop in Set Theory, January 2022

MFO workshop in Set Theory, April 2020

The Set Theory workshop in Obwerwolfach was supposed to take place April 2020, but was transformed into a webinar, due to COVID-19. Here you will find the title, abstract, slides and video of my webinar talk. Talk Title: Transformations of … Continue reading

Posted in Invited Talks | Comments Off on MFO workshop in Set Theory, April 2020

The 15th International Workshop on Set Theory in Luminy, September 2019

I gave an invited talk at the 15th International Workshop on Set Theory in Luminy in Marseille, September 2019. Talk Title: Chain conditions, unbounded colorings and the C-sequence spectrum. Abstract: The productivity of the $\kappa$-chain condition, where $\kappa$ is a regular, … Continue reading

Posted in Invited Talks | Tagged , , , , | Comments Off on The 15th International Workshop on Set Theory in Luminy, September 2019

50 Years of Set Theory in Toronto, May 2019

I gave an invited talk at the 50 Years of Set Theory in Toronto meeting, Fields Institute for Research in Mathematical Sciences, May 2019. Talk Title: Analytic quasi-orders and two forms of diamond Abstract: We study Borel reduction of equivalence relations … Continue reading

Posted in Invited Talks | Tagged , , | 1 Comment

4th Arctic Set Theory Workshop, January 2019

I gave an invited talk at the Arctic Set Theory Workshop 4 in Kilpisjärvi, January 2019. Talk Title: Splitting a stationary set: Is there another way? Abstract: Motivated by a problem in pcf theory, we seek for a new way … Continue reading

Posted in Invited Talks | Tagged , , , | Comments Off on 4th Arctic Set Theory Workshop, January 2019

11th Young Set Theory Workshop, June 2018

I gave a 4-lecture tutorial at the 11th Young Set Theory Workshop, Lausanne, June 2018. Title: In praise of C-sequences. Abstract. Ulam and Solovay showed that any stationary set may be split into two. Is it also the case that … Continue reading

Posted in Invited Talks | Tagged , , , , , , | Leave a comment