Hirotake Kurihara

collaborators

2 papers

math.CO2025

On the existence and non-existence of spherical $m$ -stiff configurations

Eiichi Bannai, Hirotake Kurihara, Hiroshi Nozaki

This paper investigates the existence of $m$ -stiff configurations in the unit sphere $S^{d - 1}$ , which are spherical $(2 m - 1)$ -designs that lie on $m$ parallel hyperplanes. We establ…

math.CO2024

Bivariate $Q$ -polynomial structures for the nonbinary Johnson scheme and the association scheme obtained from attenuated spaces

Eiichi Bannai, Hirotake Kurihara, Da Zhao +1

The study of $P$ -polynomial association schemes (distance-regular graphs) and $Q$ -polynomial association schemes, and in particular $P$ - and $Q$ -polynomial association schemes, has…

On the existence and non-existence of spherical m-stiff configurations

Bivariate Q-polynomial structures for the nonbinary Johnson scheme and the association scheme obtained from attenuated spaces

On the existence and non-existence of spherical $m$ -stiff configurations

Bivariate $Q$ -polynomial structures for the nonbinary Johnson scheme and the association scheme obtained from attenuated spaces