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Paul-Henry Leemann is currently an Assistant Professor in Department of Pure Mathematics of Xi’an Jiaotong-Liverpool University. He graduated from PhD at University of Geneva in 2016. Prior to joining XJTLU in September 2022, he worked as a postdoc at ENS Lyon (2016-2020) and as a Scientific collaborator at University of Neuch?tel (2020-2022).

Dr Leemann's research interests lie in the intersection of geometric and combinatorial group theory, graph theory and symbolic dynamic. He is particularly interested in groups acting on rooted trees and their (weakly) maximal subgroups, limits and coverings of (Schreier) graphs, rigidity phenomenon in Cayley and Schreier graphs and graphs associated to dynamical systems.

www.leemann.website

Qualifications
- Basic Certificate of Didactic in Mathematics and in Educational Science, University of Geneva (Switzerland) - 2014
- Ph.D., University of Geneva (Switzerland) - 2016
Experience
- Aug. 2022-Present, Assistant Professor, Department of Pure Mathematics, Xi'an Jiaotong-Liverpool University, China
- 2021-2022, Scientific Collaborator, Institut of Mathematics, University of Neuch?tel, Switzerland
- 2020-2021, Postdoctoral Researcher, Institut of mathematics, University of Neuch?tel, Switzerland
- 2016-2020, Postdoctoral Researcher, Department of Pure and Applied Mathematics, ENS Lyon, France
Research interests
- Geometric Group Theory
- Graph Theory
- Symbolic Dynamic
Articles
- P.-H. Leemann, G. Schneeberger, "Wreath products of groups acting with bounded orbits", accepted in l’Enseignement mathématiques (2022)
- P.-H. Leemann, G. Schneeberger, "Property FW and wreath products of groups: a simple approach using Schreier graphs", to appear in expositiones Mathematicae (2022)
- P.-H. Leemann, M. de la Salle, "Cayley graphs with few automorphisms: the case of infinite groups", Annales Henri Lebesgue Vol. 5 (2022)
- P.-H. Leemann, "Up to a double cover, every regular connected graph is isomorphic to a Schreier graph", Bulletin of the Belgian Mathematical Society – Simon Stevin Vol. 28, Issue 3 (2022)
- R. Grigorchuk, P.-H. Leemann, T. Nagnibeda, "Finitely generated subgroups of branch groups and subdirect products of just infinite groups" Izvestia: Mathematics Vol. 85 (2021)
- P.-H. Leemann, M. de la Salle, "Cayley graphs with few automorphisms", Journal of Algebraic Combinatorics Vol. 53 (2021)
- P.-H. Leemann, "Schreier graphs: Transitivity and Coverings", International Journal of Algebra and Computation Vol. 26, Issue 1 (2016)
- K. Bou-Rabee, P.-H. Leemann, T. Nagnibeda, "Weakly maximal subgroups in regular branch groups", Journal of Algebra Vol. 455 (2016)
- R. Grigorchuk, P.-H. Leemann, T. Nagnibeda, "Lamplighter groups, de Bruijn graphs, spider-web graphs and their spectra", Journal of Physics A: Mathematical and Theoretical Vol. 49, Number 20 (2016)
Grants
- Seri (2020-2022) “Group theory, topology and dynamics: Russian-Swiss collaboration”, Co-Investigator
- Mylion Postdoc (2018-2020) “Local and global geometry of graphs, groups and their actions”, PI
- SNSF Early Postdoc.Mobility (2016-2018) “Local and global geometry of graphs, groups and their actions”, PI
Professional service activities
- Co-organiser of the Self-similarity of groups, trees and fractals conference, June 2022, Institut Henri Poincaré, France
- Co-organiser of the Kervaire seminar “Baum-Connes conjecture”, Octobre 2021, Les Diablerets, Switzerland
- Local organiser of the Kervaire seminar “Geometry of groups”, March 2013, Les Diablerets, Switzerland
- External expert for the OPUS-21 grant funding scheme of the National Science Centre, Poland
- Referee for journals: Journal of Algebra, International Journal of Algebra and Computation, L’enseignement mathématiques, Expositiones Mathematicae, Journal of Algebra and its Applications
Awards and honours
- 2016 Vacheron Constantin prize for the best thesis in mathematics, University of Geneva, Switzerland

电话
+86 (0)51289165378
电子邮件
PaulHenry.Leemann@xjtlu.edu.cn
地址
MB523A(Mathematics Building)
Suzhou Dushu Lake Science and Education Innovation District
Suzhou Industrial Park
Suzhou
P.R.China
215123

Paul-Henry LeemannPh.D. in Mathematics

Profile

Qualifications

Experience

Research interests

Articles

Grants

Professional service activities

Awards and honours