Stein

About me

I am a postdoc for at the MPIM Bonn, working in the group of Catharina Stroppel. Previously I was a PhD student at Radboud university in Nijmegen supervised by Erik Koelink and Maarten van Pruijssen.

I am working on the representation theory of quantum symmetric pairs and its relations with orthogonal polynomials and geometry.

I completed my studies at Utrecht University and graduated under supervision of Marcel de Jeu.

Contact

meereboer[at]mpim-bonn[dot]mpg[dot]de

Co-organisation

In the spring of 2026 I have organized, together with Jort de Groot, an informal seminar on infinite dimensional quantum symmetric pairs and quantum gravity.
In the summer of 2026 I have organized, together with Erik Koelink, Maarten van Pruijssen and Philip Schoesser the conference Q-Sphere.

Research

Paper:

[Transformation Groups, Volume 31, pages 1851–1894, (2026)] Symmetries for spherical functions of type chi for quantum symmetric pairs https://link.springer.com/article/10.1007/s00031-025-09907-1

Preprints:

Quantum spherical functions of type chi as Macdonald-Koornwinder polynomials https://arxiv.org/abs/2502.19232
Based morphisms for characters of quantum symmetric pairs https://arxiv.org/abs/2510.17655
Joint with Philip Schlösser; Quantum matrix spherical functions as orthogonal polynomials https://arxiv.org/abs/2511.23367

Upcoming & Past Activities

Where to find me

Where to have found me

July 2026: Modern Methods in Representation Theory — Ottawa, Canada
June 2026: Q-SPHERE — Nijmegen, Netherlands (Event Page)
April 2026: RU-UvA Seminar (Talk)
March 2026: Newcastle University (Invited Talk)
March 2026: Universiteit Hasselt (Invited Talk)
February 2026: Seminar on Hopf Algebras, Quantum Groups and Monoidal Categories, VUB (Invited Talk)
Oktober 2025 Seminar on Algebra, Geometry, and Mathematical Physics, UvA, Quantum spherical functions and Macdonald polynomials.
September 2025: Rikkyo University, Tokyo (Invited Talk)
August 2025: Australia–China–Japan–Singapore–US Index Theory Conference — NUS, Singapore
August 2025: Singapore–Hong Kong Glorious Sun Symposium on Representation Theory — Singapore
July – September 2025: National University of Singapore (NUS), Singapore
June 2025: Max Planck Institute for Mathematics (MPIM), Bonn, Germany
April 2025: Hopf25 — ULB, Brussels, Belgium
January 2025: Introductory School: Methods in Representation Theory and Operator Algebras — CIRM, Marseille, France
January 2025: Intertwining Operators and Geometry — Institut Henri Poincaré (IHP), Paris, France
August 2024: GQT PhD School & Colloquium — Geometry and Quantum Theory Cluster
June 2024: Groups & Algebras in Bicocca for Young Algebraists — Milan, Italy
May 2024: Hypergeometric and Orthogonal Polynomials Event (HOPE) — Nijmegen, Netherlands
Summer 2023: Quantum Groups and Noncommutative Geometry — Prague, Czech Republic
Summer 2023: GQT PhD School & Colloquium — Geometry and Quantum Theory Cluster
Summer 2023: Processes and Heat Kernels with Symmetries — Conference with Mini-Courses, Angers, France
Spring 2023: Representation Theory of p-adic Groups and Related Topics — Workshop organized by Valentin Buciumas, University of Amsterdam
Summer 2022: Orthogonal Polynomials, Special Functions, and Applications — Radboud University Nijmegen Summer School
Summer 2021: Batumi Summer School on Algebra, Topology and Analysis: C∗ and A∞ Algebras — Tbilisi State University

If you are a masters student in Bonn that is interested in (daily) supervision of a masters thesis project, feel free to contact me.