English

On the Stanley depth of squarefree monomial ideals

Commutative Algebra 2014-09-19 v1 Combinatorics

Abstract

Let K\mathbb{K} be a field and S=K[x1,,xn]S=\mathbb{K}[x_1,\dots,x_n] be the polynomial ring in nn variables over the field K\mathbb{K}. Suppose that C\mathcal{C} is a chordal clutter with nn vertices and assume that the minimum edge cardinality of C\mathcal{C} is at least dd. It is shown that S/I(cd(C))S/I(c_d(\mathcal{C})) satisfies Stanley's conjecture, where I(cd(C))I(c_d(\mathcal{C})) is the edge ideal of the dd-complement of C\mathcal{C}. This, in particular shows that S/IS/I satisfies Stanley's conjecture, where II is a quadratic monomial ideal with linear resolution. We also define the notion of Schmitt--Vogel number of a monomial ideal II, denoted by sv(I){\rm sv}(I) and prove that for every squarefree monomial ideal II, the inequalities sdepth(I)nsv(I)+1{\rm sdepth}(I)\geq n-{\rm sv}(I)+1 and sdepth(S/I)nsv(I){\rm sdepth}(S/I)\geq n-{\rm sv}(I) hold.

Keywords

Cite

@article{arxiv.1409.5270,
  title  = {On the Stanley depth of squarefree monomial ideals},
  author = {S. A. Seyed Fakhari},
  journal= {arXiv preprint arXiv:1409.5270},
  year   = {2014}
}