Bounded powers of edge ideals and linear quotients
Let S=K[x1,…,xn] denote the polynomial ring in n variables over a field K and I⊂S a monomial ideal. Given a vector c=(c1,…,cn) of nonnegative integers, we introduce the ideal Ic⊂S which is generated by those monomials xa11⋯xann belonging to I with each ai≤ci. A fundamental observation is that, if I is generated in one degree and has linear quotients, then Ic has linear quotients. Let δ=δc(I) denote the biggest integer q for which (Iq)c≠(0). We are especially interested in when I is an edge ideal. Let G be a finite graph on [n] and I(G)⊂S the edge ideal of G. It will be reported that (I(G)δ)c is a polymatroidal ideal. In particular, (I(G)δ)c has linear quotients.
This is a joint work with Seyed Amin Seyed Fakhari, arXiv:2502.01768.