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Algebraic invariants of weighted oriented graphs

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arxiv 1910.11773 v1 pith:PG6IV22W submitted 2019-10-25 math.AC math.CO

classification math.ACmath.CO
keywords mathcalorientedweightedgraphsadditionallyalgebraiccastelnuovo-mumfordclass
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abstract

Let $\mathcal{D}$ be a weighted oriented graph and let $I(\mathcal{D})$ be its edge ideal in a polynomial ring $R$. We give the formula of Castelnuovo-Mumford regularity of $R/I(\mathcal{D})$ when $\mathcal{D}$ is a weighted oriented path or cycle such that edges of $\mathcal{D}$ are oriented in one direction. Additionally, we compute the projective dimension for this class of graphs.

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