Mustăța's Minimal Resolution Conjecture for points on projective varieties

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Let XPnX\subset\mathbb P^n be a projective variety of dimension d1d\geq 1, with reg(X)=m\operatorname{reg}(X)=m and Hilbert polynomial PXP_X. Let δ\delta satisfy PX(r1)δ<PX(r)P_X(r-1)\leq\delta<P_X(r) for some rm+1r\geq m+1, and let Γ\Gamma be a set of δ\delta points on XX in general position. If

0FnFn1F1RR/I(X)00\to F_n\to F_{n-1}\to\cdots\to F_1\to R\to R/I(X)\to0

is a minimal free RR-resolution, then R/I(Γ)R/I(\Gamma) has a minimal free resolution of the displayed type, with ar+iiar+ii+1=0a_{r+i}^i a_{r+i}^{i+1}=0 for i=1,,n1i=1,\ldots,n-1. Mustăța's Minimal Resolution Conjecture. The minimal free resolution of R/I(Γ)R/I(\Gamma) is obtained by adjoining to each FiF_i precisely the two indicated consecutive-degree summands, subject to

ar+iiar+ii+1=0(i=1,,n1).a_{r+i}^i a_{r+i}^{i+1}=0\qquad (i=1,\ldots,n-1).

This generalizes the Minimal Resolution Conjecture for points in general position in projective space; the source notes partial results and counterexamples in related settings, while the stated variety version is presented as a conjecture.

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Sources & referencesView supporting material

Primary source

Juan C. Migliore, Rosa Miró-Roig and Uwe Nagel, “Minimal Resolution of Relatively Compressed Level Algebras”, arXiv:math/0403045 (2004).

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