Margarete Ketelsen
Institut für Mathematische Logik und Grundlagenforschung
Fachbereich Mathematik und Informatik
Universität Münster
Einsteinstraße 62
48149 Münster
Office: 110.020 in Orléans-Ring 10
Email: firstname.lastname@uni-muenster.de
Phone: +49 251 83-36870
I am interested in the model theory of valued fields, in particular: tame valued fields, perfectoid fields & tilting and (relative) quantifier elimination, also definability of valuations.
Preprints
- 🎂 NEW! 🎂 Composition Ax-Kochen/Ershov principles and tame fields of mixed characteristic (with an appendix by Philip Dittmann)
- Definable Henselian valuations in positive residue characteristic (with Simone Ramello and Piotr Szewczyk), to appear in J. Symb. Log.
Talks
Notes and Slides from past talks
- Model-theoretic tilting, 4 August 2025, ddg40 : Structures algébriques et ordonnées, Banyuls-sur-Mer (France). slides
- Definable Henselian valuations in positive residue characteristic (about joint work with Simone Ramello and Piotr Szewczyk),
- 13 March 2024, Young Women in Model Theory and Applications, Hausdorff Center for Mathematics in Bonn. notes
- 7 February 2024, LLAMA Seminar, ILLC Amsterdam. notes
- 9 November 2023, GRK 2240, Düsseldorf. notes
- 4 October 2023, PhDs in Logic, Granada. slides
- A proof of Greenberg's Theorem using ultrapowers, 19 August 2021, ALGAR 2021 Summer School, Antwerp. slides
Theses
- PhD thesis: Understanding the model theory of henselian valued fields by parts, Universität Münster, 2026. (advisor: Prof. Dr. Franziska Jahnke)
- Master's thesis: Quasi-finite axiomatizability in the class of finitely generated rings, Technische Universität Dresden, September 2022. (advisors: Prof. Dr. Arno Fehm, Dr. Philip Dittmann)
- Bachelor's thesis (in German): Polynomgleichungen über henselschen Bewertungsringen (Polynomial equations over Henselian valuation rings), Technische Universität Dresden, July 2020. (advisors: Prof. Dr. Arno Fehm, Dr. Philip Dittmann)