Regularity conjecture for t-connected ideals of trees

Let TT be a tree, let tt be a positive integer, and let Jt(T)J_t(T) denote the tt-connected ideal of TT. Let H\mathcal H be the hypergraph corresponding to Jt(T)J_t(T), and write ν(H)\nu(\mathcal H) for its matching number. Regularity conjecture for t-connected ideals. One has

reg(R/Jt(T))=(t1)ν(H).\operatorname{reg}(R/J_t(T))=(t-1)\nu(\mathcal H).

The conjecture is motivated by computational evidence and by the fact that the analogous formula holds in the examples discussed in the paper, but its general validity for trees is left open.

Sources & referencesView supporting material

Primary source

Kanoy Kumar Das, Amit Roy and Kamalesh Saha, “On the path ideals of chordal graphs”, arXiv:2405.15897 (2024).

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