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- W1528917749 abstract "For given positive integers $ngeq d$, a $d$-uniform clutter on a vertex set $[n]={1,dots,n}$ is a collection of distinct $d$-subsets of $[n]$. Let $mathscr{C}$ be a $d$-uniform clutter on $[n]$. We may naturally associate an ideal $I(mathscr{C})$ in the polynomial ring $S=k[x_1,dots,x_n]$ generated by all square-free monomials smash{$x_{i_1}cdots x_{i_d}$} for ${i_1,dots,i_d}inmathscr{C}$. We say a clutter $mathscr{C}$ has a $d$-linear resolution if the ideal smash{$I(overline{mathscr{mathscr{C}}})$} has a $d$-linear resolution, where smash{$overline{mathscr{C}}$} is the complement of $mathscr{C}$ (the set of $d$-subsets of $[n]$ which are not in $mathscr C$). In this paper, we introduce some classes of $d$-uniform clutters which do not have a linear resolution, but every proper subclutter of them has a $d$-linear resolution. It is proved that for any two $d$-uniform clutters $mathscr{C}_1$, $mathscr{C}_2$ the regularity of the ideal $I(overline{mathscr{C}_1 cup mathscr{C}_2})$, under some restrictions on their intersection, is equal to the maximum of the regularities of $I(overline{mathscr{C}}_1)$ and $I(overline{mathscr{C}}_2)$. As applications, alternative proofs are given for Froberg's Theorem on linearity of edge ideals of graphs with chordal complement as well as for linearity of generalized chordal hypergraphs defined by Emtander. Finally, we find minimal free resolutions of the ideal of a triangulation of a pseudo-manifold and a homology manifold explicitly." @default.
- W1528917749 created "2016-06-24" @default.
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- W1528917749 date "2016-06-09" @default.
- W1528917749 modified "2023-10-15" @default.
- W1528917749 title "Regularity and Free Resolution of Ideals Which Are Minimal To $d$-Linearity" @default.
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