Research Interests

I have been studying hyperplane arrangements. Hyperplane arrangements appear many branches of mathematics including combinatorics, representation theory, topology, etc. I am mainly interested in two topics: I am also interested in computational complexity of real numbers, especially for the so called "periods" (introduced by Kontsevich and Zagier), the real numbers which have integral expressions.

See also List of papers and Comments (JAPANESE).

Post Docs: Students: I welcome students who are interested in (at least one of) research areas: combinatorics, algebraic geometry and topology. (21 Feb. 2013)