Terai's conjecture on sequential Cohen–Macaulay edge ideals of weighted graphs

Let GG be a Cohen–Macaulay very well-covered graph, and let S=K[x1,,xn]S=K[x_1,\ldots,x_n] be a standard graded polynomial ring over a field KK. For a weight function w:E(G)Z>0\mathbf w:E(G)\to\operatorname{\mathbb{Z}}_{>0}, define the edge ideal

I(Gw)=((xixj)w(xixj){xi,xj}E(G))S.I(G_{\mathbf w})=\big((x_ix_j)^{\mathbf w(x_ix_j)}\mid\{x_i,x_j\}\in E(G)\big)\subseteq S.

Terai's conjecture. The ideal I(Gw)I(G_{\mathbf w}) is sequentially Cohen–Macaulay for every weight function w\mathbf w. This conjecture extends questions about Cohen–Macaulayness and sequential Cohen–Macaulayness of edge ideals of edge-weighted graphs. The source presents it as a conjecture attributed to Terai; its resolution is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

Ly Thi Kieu Diem, Nguyen Cong Minh and Thanh Vu, “The sequentially Cohen-Macaulay property of edge ideals of edge-weighted graphs”, arXiv:2308.05020 (2023).

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