Charlene Kalle

How to reach me

Research interests

My research is in ergodic theory, the area of mathematics concerned with the typical long term behaviour of dynamical systems. I have a special interest in intermittency in random dynamics, dynamics related to number expansions and the fractals that surface naturally in these contexts.

PhD students

• Niels Langeveld graduated in December 2019 on his thesis Matching, entropy, holes and expansions.
• Marta Maggioni graduated in March 2021 on her thesis Measures and matching for number systems.
• Benthen Zeegers graduated in February 2023 on his thesis Intermittency and number expansions for random interval maps.
• Jonny Imbierski started his PhD project in September 2020 under joint supervision of Dalia Terhesiu and myself.
• Yan Huang is a PhD student with Derong Kong at Chongqing University. In 2023 she worked on her PhD research in Leiden under my supervision.
• Sven van Dijk started his PhD project in September 2023 under joint supervision of Tony Samuel and myself.

Publications

My publications include three textbooks, around twenty peer reviewed scientific articles and a couple of outreach articles. Click on the button below for a full publication list.

• Publication list

Foundation Compositio Mathematica

I am a board member and the secretary of the Foundation Compositio Mathematica, which is the foundation behind the three journals Compositio Mathematica, Algebraic Geometry and Moduli. It has the aim of publishing first class papers in the central areas of mathematical research and supporting mathematics and mathematical research. The foundation supports mathematics via subsidies for mathematical conferences, prizes for mathematical accomplishments and other initiatives. Applications can be done through the foundation's website.

Koninklijk Wiskundig Genootschap

I am a board member and the secretary of the Royal Dutch Mathematical Society, Koninklijk Wiskundig Genootschap, which was founded in 1778 and has the distinction of being the oldest of all present-day national mathematical societies. It serves as the professional organization of individuals, in particularly the Netherlands, whose activities are related to mathematics.

Outreach activities

• Interview in the episode on fractals of Radio Weetlust
• Publication of De oorsprong van ergodentheorie in the Nieuw Archief voor Wiskunde in 2021
• Presentation at the KNAW Evening of the Abel Prize 2021
• Presentation at the Nacht van Ontdekkingen 2018
• Publication of Tegeltjeswijsheden in Eureka! in 2017
• Publication of Bewogen getallen in the Nieuw Archief voor Wiskunde in 2011

Teaching activities

In the academic year 2024/2025 I teach the mastermath course Ergodic Theory together with Karma Dajani, the bachelor course Dynamics and Chaos with Martina Chirilus-Bruckner, and the bachelor course Introduction to Measure Theory with Floske Spieksma.

This year I am also co-teaching two courses in the International Mathematics Master, namely Functional Analysis in Algiers, Algeria and Measure Theory in Lahore, Pakistan.

I am chairing the board of examiners for the bachelor and master of mathematics at Leiden University.