Activities - Conferences & Seminars
Conferences, workshops, and seminars organized by the members of the AHGT network.
The AHGT Seminar
An hybrid seminar that takes place between LPP Lille and RIMS Kyoto on a monthly basis by Zoom and which covers the three topics of the AHGT project. Contact the local organizer of your choice in case of interest.
RIMS Zoom Hybrid Org.: B. Collas (RIMS, JP), Y. Hoshi (RIMS, JP), K. Sawada (RIMS Kyoto), P. Dèbes (Lille, FR), A. Mézard (ENS, FR).
Workshop Arithmetic France-Japan - 日本 x フランス 数論幾何学 2025
Tokyo April 14-18, 2025 Org.: N. Imai (Tokyo), F. Lemma (IMJ-PRG) & T. Ochiai (IST).
Webpage of the workshop
Workshop Low dimensional topology and number theory XVI: In honor of Professor Hiroaki Nakamura's 60th birthday (partner event)
Osaka March 25-28, 2025 Org.: M.Morishita (Kyushu), H.Ogawa (Osaka), T.Satoh (Tokyo), Akio Tamagawa (RIMS).
Webpage of the workshop Poster
Inter-universal Teichmüller Theory Summit 2025.
Kyoto Hybrid March 17-20, 2025 Org.: Y. Hoshi (RIMS), S. Mochizuki (RIMS), B. Collas (RIMS) & E. Lepage (IMG-PRG).
Webpage of the workshop
Algebraic & Arithmetic Geometry 2024.
6th Kyoto+ Workshop
Nanjing Zoom Hybrid October 25-29, 2024 Org.: Y. Yang (RIMS) et al.
Webpage of the workshop
Anabelian Geometry and Representations of Fundamental Groups.
Oberwolfach workshop
MFO-RIMS Sep. 29-Oct. 4, 2024 Org.: A. Cadoret, F. Pop, J. Stix, A.. Topaz
Webpage of the workshop
Arithmetic Homotopy & Galois Theory.
Oberwolfach-RIMS tandem workshop
MFO-RIMS Sep. 24-29, 2023 Org.: B. Collas, P. Dèbes, Y. Hoshi, A. Mézard
Webpage of the workshop
Algebraic & Arithmetic Geometry 2023.
5th Kyoto+ Workshop
Nanjing Zoom Hybrid Aug. 24-28, 2023 Org.: Y. Hoshi (RIMS), Z. Hu (Nanjing), P. Huang (Heidelberg), Y. Yang (RIMS), R. Zong (Nanjing)
Webpage of the workshop
Arithmetic & Homotopic Galois Theory 2023
ENS-RIMS Zoom Hybrid Mar. 20-24, 2023 Org.: B. Collas, P. Dèbes, Y. Hoshi, A. Mézard
Webpage of the workshop
Focus events to introduce and report on the latest topics and progress of the arithmetic homotopy and Galois theory program.
Dawn · Midi · Yofuke International Seminar 2025 - Explicit Methods in Homotopy and Arithmetic
Hybrid and Wesleyan, US Sep.-Oct, 2025 Org.: B. Collas, and C. Rasmussen
Webpage of the workshop
Anabelian Geometry in Yokohama 2025
Yokohama Sep. 02-03, 2025 Org.: B. Collas, Y. Ozeki, Y. Taguchi, and N. Yamaguchi
Webpage of the workshop
Spring seminar on Arithmetic Galois theory in Toyonaka 2025
Osaka - Toyonaka Mar. 31-Apr. 1, 2025 Org.: B. Collas, P. Dèbes, and H. Nakamura
Webpage of the workshop
Journées galoisiennes d’hiver 2024
Hybrid and Caen, France Dec. 16.-17, 2024 By B. Deschamps (Caen & Lemans, France)
Program & schedule
Lecture on ``Berkovich methods for anabelian reconstructions and Resolution of Nonsingularities''
RIMS, Japan April 8, 10 and 12, 2024 By E. Lepage (IMJ Paris, France)
Schedule & Program
Workshop on Model theory of valued fields and applications.
Lille Feb. 19-21, 2024 Org.: R. Cluckers (CNRS-Lille), A. Forey (CNRS-Lille), Y. Hendel (KU Leuven)
Webpage of the workshop
Étale homotopy type and application
Paris & RIMS Kyoto [Bridge] September 26, 2025 Org.: M. Ferreira-Filoramo, A. Galet, N. Yamaguchi
Webpage of the workshop
Spaces and perfectoids
Paris & RIMS Kyoto [Bridge] July 19, 2024 Org.: M. Ferreira-Filoramo, S. Philip & N. Takada & N. Yamaguchi
Webpage of the workshop
Around the Grothendieck-Teichmüller group
Paris & RIMS Kyoto [Bridge] Feb. 27, 2024 Org.: M. Ferreira-Filoramo, S. Philip & N. Yamaguchi
Webpage of the workshop
Local-global principles and the patching method
Paris & RIMS Kyoto [Bridge] June 27, 2023 Org.: E. Boughattas, S. Philip & N. Yamaguchi
Webpage of the workshop
The AHGT Ateliers are one-day events organized by and for early-career researchers to discover and get a working understanding of both fundamental and hot topics in Arithmetic and Homotopic Galois Theory.
Talks are distributed in advance among participants, who also propose and vote the next event topic.
A selection of previous events that support the present activity of the IRN, feel free to consult the report, program, and slides of the talks.
Homotopic and Geometric Galois Theory
Oberwolfach workshop 2021
MFO - Zoom Hybrid Mar. 7-13, 2021 Org.: B.Collas, P.Dèbes, H.Nakamura, J.Stix
Report [PDF]
Arithmetic Geometry and Symmetries around Galois and Fundamental Group
Oberwolfach mini-workshop 2018
MFO Apr. 15-21, 2018 Org.: B.Collas, M.Fried, P.Dèbes
Report [PDF]
Combinatorial Anabelian Geometry
The 29th Number Theory Summer School, 2022
Org.: S. Tsujimura, Y. Hoshi, A. Minamide, G. Yamashita
Notes of the lectures [PDF]
Promenade in Inter-Universal Teichmüller Theory
Lille-RIMS seminar 2020-2021
Sept. 2020 - Apr. 21, 2021 Org.: B.Collas, P.Dèbes, B.Fresse
Report [PDF+WEB]