4 papers
Algebras with straightening laws on join- or meet-semidistributive lattices
Koji Matsushita, Sora Miyashita, Koichiro Tani
We study algebras with straightening laws on join- or meet-semidistributive lattices. We show that for a join-semidistributive (resp. meet-semidistributive) lattice, meet-distribut…
Standard multigraded Hibi rings and Cartwright-Sturmfels ideals
Koji Matsushita, Koichiro Tani
In this paper, we introduce standard multigradings on Hibi rings, which are algebras arising from posets. We show that any standard multigrading on a Hibi ring that makes its defin…
Initial ideals of generic ideals and variations of Moreno-SocÃas conjecture
Koichiro Tani
It is known that the initial ideals of generic ideals are the same. Moreno-SocÃas conjectured that the initial ideal of generic ideals with respect to the degree reverse lexicogra…
Khovanskii bases of subalgebras arising from finite distributive lattices
Akihiro Higashitani, Koji Matsushita, Koichiro Tani
The notion of Khovanskii bases was introduced by Kaveh and Manon. It is a generalization of the notion of SAGBI bases for a subalgebra of polynomials. The notion of SAGBI bases was…