# Masahiko Yoshinaga

Japanese (日本語),

**
Department of Mathematics, **

Graduate School of Science,

Osaka University,

Toyonaka, Osaka 560-0043, JAPAN

Photo

email: yoshinaga [at] math.sci.osaka-u.ac.jp

(or: mh.yoshinaga [at] gmail.com)

Talk: TBA
Colloquium, Osaka University 30 Jan. 2023,
We are organizing
Combinatorics, geometry and commutative algebra of hyperplane arrangements (16 - 20 Jan. 2023, Kyushu University)
We are organizing
Workshop on Magnitude 2022 (22 - 23 Dec. 2022, Osaka)
We are organizing
Various Guises of Reflection Arrangements (13 - 17 Mar 2023, Edinburgh)
Talk: TBA
Characteristic Polynomials of Hyperplane Arrangements
and Ehrhart Polynomials of Convex Polytopes RIMS
Talk: TBA,
有限群論，代数的組合せ論，頂点代数の研究 (RIMS)
Talk: TBA, トポロジー火曜セミナー, 東京大学 (Zoom)
Preprint:
(with Suguru Ishibashi,
and
Sakumi Sugawara)
Betti numbers and torsions in homology groups of double coverings.
arXiv:2209.02236
I join the editorial board of
Order (Jul. 2022).
Talk: TBA (2022/09/22)
Japan-Vietnam Singularity Seminar (Zoom)
Schedules and related conferences
I have moved to Osaka University (2022/04/01)

I am working in the following topics. (See
Research Activity for details.)
- Logarithmic vector fields and freeness、
- Topology of hyperplane arrangements.
- Lattice points countings.
- Matroids and Tutte polynomials.
- Categorification of enumerative problems, magnitude homology of metric spaces

Dept of Math,
Graduate School of Science,
Osaka University