31 research outputs found
Persistence and stability properties of powers of ideals
We introduce the concept of strong persistence and show that it implies
persistence regarding the associated prime ideals of the powers of an ideal. We
also show that strong persistence is equivalent to a condition on power of
ideals studied by Ratliff. Furthermore, we give an upper bound for the depth of
powers of monomial ideals in terms of their linear relation graph, and apply
this to show that the index of depth stability and the index of stability for
the associated prime ideals of polymatroidal ideals is bounded by their
analytic spread.Comment: 15 pages, 1 figur
Gr\"obner bases of balanced polyominoes
We introduce balanced polyominoes and show that their ideal of inner minors
is a prime ideal and has a quadratic Gr\"obner basis with respect to any
monomial order, and we show that any row or column convex and any tree-like
polyomino is simple and balanced
Regularity of joint-meet ideals of distributive lattices
Let be a distributive lattice and the associated Hibi ring. We
compute \reg R(L) when is a planar lattice and give a lower bound for
\reg R(L) when is non-planar, in terms of the combinatorial data of
As a consequence, we characterize the distributive lattices for which the
associated Hibi ring has a linear resolution
Polarization of Koszul cycles with applications to powers of edge ideals of whisker graphs
In this paper, we introduced the polarization of Koszul cycles and use it to
study the depth function of powers of edge ideals of whisker graphs