This conference is the 2025 edition of a series of events around numeration systems and substitution systems. The central themes of this conference include (but are not limited to): number theory, diophantine approximation, fractal geometry, substitution, combinatorics on words, ergodic theory, dynamical systems, and computer science. 

Previous Years:

• Numeration 2024 – Utrecht, June 2024
• Numeration 2023 – Liège, May 2023
• Numeration 2019 – Vienna, July 2019
• Numeration 2018 – Paris, May 2018
• Numeration 2017 – Rome, June 2017
• Numeration 2016 – Prague, May 2016
• Numeration 2015 – Nancy, May 2015
• Numeration and Substitution 2014 – Debrecen, July 2014
• Numeration and Substitution: 2012 – Kyoto, June 2012
• Numeration 2011 – Liège, June 2011
• Numeration – Leiden, June 2010
• Numeration: Mathematics and Computer Science – Marseille, March 2009
• Journées Numération – Prague Czech Technical University, May 2008
• Journées de Numération – Graz, April 2007
• Journées Numération, Pavages, Substitutions – Grenoble, March 2005

8-12 September 2025

Room 1D201, Building 1D, Area 1, University of Tsukuba

Registration: July 31 
Please note that we may have to close registration even before the deadline due to room capacity. 

A limited amount of contributed talks will be accepted. Poster presentations will also be accepted. In either case, title and abstract should be submitted through Registration form. 
The deadline for title and abstract: May 16
Please note that if there are a large number of applications for talks, applicants may be asked to change to poster presentations. 

5,000 Japanese yen (estimated)

Pieter Allaart (University of North Texas)

Mumtaz Hussain (La Trobe University)

Seonhee Lim (Seoul National University)

Kota Saito (Nihon University)

Baowei Wang (Huazhong University of Science and Technology)