The Scarf complex of squarefree powers, symbolic powers of edge ideals, and cover ideals of graphs

Abstract

Every monomial ideal $I$ has a Scarf complex, which is a subcomplex of its minimal free resolution. We say that $I$ is Scarf if its Scarf complex is also its minimal free resolution. In this paper, we fully characterize all pairs $(G,n)$ of a graph $G$ and an integer $n$ such that the squarefree power $I(G{)}^{[n]}$ or the symbolic power $I(G{)}^{(n)}$ of the edge ideal $I(G)$ is Scarf. We also determine all graphs $G$ such that its cover ideal $J(G)$ is Scarf, with an explicit description when $G$ is either chordal or bipartite.

20 pages. Minor revisions. Comments welcome!

References in corpus (2)

• Squarefree powers of edge ideals of forests
• Barile-Macchia resolutions