The Eisenbud-Koh-Stillman Conjecture on Linear Syzygies

Details The Eisenbud-Koh-Stillman Conjecture on Linear Syzygies The Eisenbud-Koh-Stillman Conjecture on Linear Syzygies

1996-02-28

arxiv.org/abs/alg-geom/9602020v1

Mathematics

Algebraic Geometry

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It is proved, as was conjectured by Eisenbud-Koh-Stillman, that for a finitely generated graded module $M$ over the symmetric algebra $S(V)$, if the Koszul group ${\cal K}_{p,0}(M,V)\ne 0$, then the set of rank 1 relations in $M_0\otimes V$ has dimension $\ge p$. The method is by using ``exterior minors" to study syzygies of an ideal derived from the Koszul class in the exterior algebra. As a consequence, a conjecture of Lazarsfeld and myself that a set $Z$ of $2r+1-p$ points in ${\bf P}^r$ for which property $N_p$ fails has a subset $Z'$ of at least $2{\rm dim}(L) +2-p$ points lying on a linear space $L$ such that property $N_p$ fails for $Z'$.

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