# Talks

**On the Logical Instability of Mathematical Theories**, Bergen Logic Group Seminar, University of Bergen, 10 May 2022.**On the logical structure of constructive set theories**, Logic4Peace, 23 April 2022.**On the logical structure of constructive set theories**, Logic Seminar, Department of Philosophy, Peking University, 8 March 2022.**Should Pluralists be Pluralists about Pluralism?**, British Logic Colloquium PhD Day, Durham University, 1 September 2021 (conference).**Logical Pluralism and Meta-Logic**, Bergen Logic Group Seminar, University of Bergen, 19 February 2021.**Converse Extensionality and Apartness**, STiHAC Seminar, Hamburg-Amsterdam-Cambridge, 28 January 2021.**Converse Extensionality and Apartness**, Categories and Types Seminar (CATS), ILLC, University of Amsterdam, 10 December 2020 (seminar).**Logics of Intuitionistic Kripke-Platek Set Theory**, DMV Annual Meeting 2020, TU Chemnitz, 16 September 2020.**Apartness in Constructive Set Theory**, Forschungsseminar Mathematische Logik, University of Hamburg, 15 April 2020 and 22 April 2020.**De Jongh’s Theorem for Intuitionistic Zermelo-Fraenkel Set Theory**, 28th EACSL Annual Conference on Computer Science Logic (CSL 2020), Barcelona, Spain, 13-16 January 2020 (conference).**De Jongh’s Theorem for Intuitionistic Zermelo-Fraenkel Set Theory**, DMV-Jahrestagung 2019, Sektion: Logik und Theoretische Informatik, Department of Mathematics (MATH), Karlsruhe Institute of Technology (KIT), 25 September 2019 (conference).**E-models of IZF and intuitionistic multiverses**, Joel David Hamkins in Amsterdam 2019, ILLC, University of Amsterdam, 11 May 2019 (workshop).**The de Jongh Property for bounded constructive Zermelo-Fraenkel set theory**, TULIPS – The Utrecht Logic in Progress Series, Utrecht University, 5 March 2019 (seminar).**Constructing illoyal algebra-valued models of set theory**, SYSMICS 2019, Amsterdam, 21-25 January 2019 (conference).**Logical aspects of algebra-valued models of set theory**, Algebra|Coalgebra Seminar, ILLC, University of Amsterdam, 19 December 2018 (seminar/abstract).**The de Jongh Property for a Subtheory of CZF**, Oberseminar mathematische Logik, University of Bonn, 6 November 2018 (seminar/abstract).**The Propositional Logic of Models of Set Theory**, Colloquium Logicum 2018, 15 September 2018 (conference).**Heyting structures: Loyalty, faithfulness and an application to the de Jongh property**, Forschungsseminar Mathematische Logik, University of Hamburg, Germany, 7 May 2018 (abstract, seminar).**Constructing models of constructive or intuitionistic set theory from classical models of set theory**, Categories Seminar, University of Cambridge, United Kingdom, 13 February 2018 (abstract).**Surreal Numbers**, Set Theory Seminar, University of Cambridge, United Kingdom, 31 January 2017 (abstract).**One Axiom to Rule Them All**, Cool Logic Seminar, ILLC, University of Amsterdam, The Netherlands, 4 November 2016 (abstract).

## Outreach

**Ist “Unendlich” eine Zahl?**, Online KinderCollege, DHBW Karlsruhe, Germany, 21 October 2020 (flyer).