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Frans Oort has had a distinguished career with interests in algebraic geometry, arithmetic algebraic geometry, moduli of abelian varieties in positive characteristic. He has worked at Leiden ľ¹Ï¸£ÀûÓ°ÊÓ, Harvard ľ¹Ï¸£ÀûÓ°ÊÓ, Aarhus ľ¹Ï¸£ÀûÓ°ÊÓ, ľ¹Ï¸£ÀûÓ°ÊÓ of Amsterdam, Columbia ľ¹Ï¸£ÀûÓ°ÊÓ. He is currently Professor Emeritus at Utrecht ľ¹Ï¸£ÀûÓ°ÊÓ. 

He is perhaps best known for the André–Oort conjecture, a problem in Diophantine geometry.

His research history, including many open source publications, lectures, and videos are available on his own and the

Johan Commelin (Utrecht ľ¹Ï¸£ÀûÓ°ÊÓ), Remy van Dobben de Bruyn (Utrecht ľ¹Ï¸£ÀûÓ°ÊÓ), and Ben Moonen (Radboud ľ¹Ï¸£ÀûÓ°ÊÓ) are pleased to be able to honour Frans and his work through this symposium.

• Dates: 6 – 7 November, 2025
• Location: Boothzaal, Utrecht Science Park Library
• Registration is free and lunch is included, but please do .

Speakers

We are pleased to welcome the following speakers:

• Jennifer Balakrishnan, Boston ľ¹Ï¸£ÀûÓ°ÊÓ
• Ching-Li Chai, ľ¹Ï¸£ÀûÓ°ÊÓ of Pennsylvania
• Emma Brakkee, Leiden ľ¹Ï¸£ÀûÓ°ÊÓ
• Jakob Stix, Frankfurt ľ¹Ï¸£ÀûÓ°ÊÓ
• Olivier de Gaay Forman, Utrecht ľ¹Ï¸£ÀûÓ°ÊÓ
• Valentijn Karemaker, ľ¹Ï¸£ÀûÓ°ÊÓ of Amsterdam

On Friday 7 November, the afternoon session, including speakers and the reception requires no registration. They are aimed at a general mathematical audience and everyone is welcome. Tentatively the following speakers are scheduled for this session:

• Jaap Top, ľ¹Ï¸£ÀûÓ°ÊÓ of Groningen
• Don Zagier, MPIM Bonn

For the most recent titles, abstracts, and schedule please visit the .

Funding Option

We have limited support available towards the overnight stay and travel of junior participants. Preference will be given to applicants who register before September 15, 2025.

Please contact Johan Commelin for further information: j.m.commelin@uu.nl

Sponsors