33èmes Journées Arithmétiques

30 June to 4 July 2025

University of Luxembourg





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Scientific Committee

Plenary Speakers

There will be an additional public lecture by Kristin Lauter (West Coast Director of Research Science at the Fundamental AI Research team at Meta) on the new era of AI for mathematics.

Contributed talks

As customary for Journées Arithmétiques there will be parallel sessions of contributed talks, thematically sorted. You will find on this page (in due time) the instructions for how to submit an abstract and propose a contributed talk.
The book of abstracts can be consulted online on this page (in due time).


The main organizers are Antonella Perucca and Gabor Wiese from the University of Luxembourg.
Laura Capuano and Valerio Talamanca from the University of Roma 3 (in the name of RNTA) provide organizatorial support. Local organizers will include PhD students and postdocs from the Mathematics Department of the University of Luxembourg.
The organizing team also comprises administrative staff: Katja Badanjak, Emilie De Jonge, Rita Giannini, Marie Leblanc.

History of the JA

The Journées Arithmétiques (JA) have a glorious history. Their first edition was held in 1960 in Grenoble and starting in the 1980’s the location alternates between France and another country in Europe. The JA have toured the United Kingdom, Switzerland, Spain, Italy, Austria, Lithuania, Hungary, Turkey, and are now coming to Luxembourg. Some major results in number theory were first presented at JA, such as the proofs of the irrationality of zeta of 3 by Apéry, of the Iwasawa Main Conjecture by Coates and Wiles, and of the Mordell Conjecture by Faltings. You can find more information in the Histoire des Journées Arithmétiques by Jacques Martinet.

Nowadays, the event is probably the largest number theory gathering in the world, attracting both junior and senior mathematicians (the last edition hosted more than 300 participants from 42 countries). The last editions were held in Nancy and Istanbul. JA25 is the 33rd edition, in the year (20+25)².


Location and Schedule

Journées Arithmétiques 2025 is an in-person event, fully in English. We plan to record plenary lectures (in accordance with the speakers).

The conference is held at Campus Belval of the University of Luxembourg in Esch-sur-Alzette (Luxembourg), here a map and the google location.

There will be a Conference Desk open all days of the conference. This is the best way to ask for information or assistance (e.g. recover lost items).

The precise rooms for the event will be communicated on this page in due time. We plan dedicated working spaces for exchanging. The Luxembourg Learning Center LLC is a quiet place to work.

TIME: Monday Tuesday WednesdayThursdayFriday
9:00-10:00 Plenary Talk Plenary Talk Plenary Talk Plenary Talk Plenary Talk
10:00-10:45 Coffee Break Coffee Break Coffee Break Coffee Break Coffee Break
10:45-11:45 Plenary Talk Plenary Talk Plenary Talk Plenary Talk Plenary Talk
11:45-13:45 Lunch Lunch Lunch Lunch Lunch
13:45-15:45Contributed TalksContributed TalksExcursionContributed Talks Contributed Talks
15:45-16:30 Coffee Coffee Excursion Coffee Coffee
16:30-18:00 Contributed Talks Contributed Talks Excursion Public Lecture Problem Session

The above schedule is subject to modifications.

The conference opening is Monday at 8:45 (the Welcome Desk opens at 8:00). Closing remarks, including the official announcement of the location of JA26, will be made on Friday at 11:45. As customary, Wednesday afternoon is dedicated to the cultural program. The conference dinner is on Thursday (more information will follow). The conference picture is Tuesday at 10:00 (for the willing participants; the picture will be uploaded on this website).

There is a public lecture on Thursday afternoon, and a problem session to brainstorm on open research questions on Friday afternoon.


To ensure accomodation availability and possibly better prices we recommend that you book your stay much in advance. Upon registration you can apply for support, and indeed we will arrange the stay of selected participants (the selection being made on merit and need). We will also try to arrange discounts or partial reimbursement for many more participants (information will be provided). Consider also the option of sharing a double room with some participant that you know.

There is an Ibis Hotel on Campus Belval, and there are several hotels in Esch and Luxembourg City. We also recommend the Youth Hostels. While looking for cheap accomodation, you may also look in France (consider that Campus Belval is less than 1km away from the French border).

The most sustainable hotels are usually marked with Ecolabel. For better accessibility, you may consult the accomodations suggested by EureWelcome. You may also wish to consult the Wheelchair Accessible Travel Guide.


Cultural program

Food & Drinks



The organizers of the Journées Arithmétiques 2025 would like to thank the University of Luxembourg and the Luxembourgish Mathematical Society, the Centre International de Mathématiques Pures et Appliquées (CIMPA), the Journal of Number Theory (Elsevier), the Roman Number Theory Association (RNTA), and the Société mathématique de France (SMF), for their generous financial and/or logistic support.