• We will organize an international conference "Arrangements in Osaka 2025" (The University of Osaka, Toyonaka Campus, December 15-19, 2025).

• A paper "On Universal derivations for multiarrangements" (Takuro Abe, Shota Maehara, Gerhard Roehrle, Sven Wiesner) is now available on arXiv (November 2025).

• Abe gave a talk at AMS Fall Southeastern Meeting 2025 Special Session on Hyperplane arrangements and Polytopes in Tulane University on "Regularity of logarithmic modules of hyperplane arrangements" (October 2025).

• A paper "Addition theorems for Ziegler pairs of hyperplane arrangements" (Takuro Abe, Lukas Kuhne, Piotr Pokora) is now available on arXiv (September 2025).

• A paper "Solomon-Terao polynomials and Castelnouvo-Mumford regularity of hyperplane arrangements" (Takuro Abe) is now available on arXiv (September 2025).

• Applied Mathematics Seminar in Rikkyo University #2 (Speaker: Bruno Buchberger (Johannes Kepler University)) was held (September 2025). 

• Abe gave a talk at Moduli, Hilbert Schemes and Singularities in Babeș-Bolyai University on "Castelouvo-Mumford regularity and Solomon-Terao polynomial of hyperplane arrangements" (September 2025).

• Abe gave a talk at Topology of Arrangements with an Eye to Applications in University of Pisa on "Restriction of free arrangements" (September 2025).

• We organized an international conference "New perspectives of coinvariant rings from viewpoints of geometry and algebraic combinatorics" (RIMS, July 2025).

• Abe gave a talk at "Oberseminar Groups and Geometry" in Bielefeld University on "Free path and restrictions of hyperplane arrangements" (July 2025).

• Website of this project is now ready! (June 2025).

• We organized and Abe gave a talk in the meeting "Arrangement Days in NiTech 2025" (June 2025).

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Conferences:

• International Conference "Workshop on Algebraic Geometry in Kanazawa" (Kanazawa, December 1-5, 2025)

• International Conference "Arrangements in Osaka 2025" (The University of Osaka, Toyonaka Campus, December 15-19, 2025)

Seminars:

• Applied Mathematics Seminar in Rikkyo University (details are in Japanese)

• Hyperplane Arrangements Seminar (details are in Japanese)

List of research achievements is here.

Principal Investigator: Takuro Abe (Rikkyo University)

Co-Investigators: Shizuo Kaji (Kyushu University / Kyoto University)

　　　　　　 Shunsuke Takagi (The University of Tokyo)

　　　　　　 Masaya Yasuda (Rikkyo University)

　　　　　　 Masahiko Yoshinaga (Osaka University)　　　　

Secretaries: A. Taniguchi (Mon., Wed. & Fri.), N. Kuroda (Tue., Wed. & Thu.)