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λ-minimal graphs

Bulletin of the Australian Mathematical Society (1)

Australian Mathematical Society Inc (1)

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It is well known that the edge ideal $I(G)$ of a simple graph G has linear quotients if and only if $G^c$ is chordal. We investigate when the property of having linear quotients is inherited by homological shift ideals of an edge ideal. We will see that adding a cluster to the graph $G^c$ when $I(G)$ has homological linear quotients results in a graph with the same property. In particular, $I(G)$ has homological linear quotients when $G^c$ is a block graph. We also show that adding pinnacles to trees preserves the property of having homological linear quotients for the edge ideal of their complements. Furthermore, $I(G)$ has homological linear quotients for every graph G such that $G^c$ is a $\lambda$ -minimal chordal graph.

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HOMOLOGICAL LINEAR QUOTIENTS AND EDGE IDEALS OF GRAPHS

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HOMOLOGICAL LINEAR QUOTIENTS AND EDGE IDEALS OF GRAPHS