Some algebraic consequences of Green's hyperplane restriction theorems

Details Some algebraic consequences of Green's hyperplane restriction theorems Some algebraic consequences of Green's hyperplane restriction theorems

2009-07-22

arxiv.org/abs/0907.3912v2

JPAA 214 (2010), no. 7, 1263-1270

Mathematics

Commutative Algebra

A few revisions. Final version to appear in JPAA

Scientific paper

We discuss a paper of M. Green from a new algebraic perspective, and provide applications of its results to level and Gorenstein algebras, concerning their Hilbert functions and the weak Lefschetz property. In particular, we will determine a new infinite class of symmetric $h$-vectors that cannot be Gorenstein $h$-vectors, which was left open in a recent work of Migliore-Nagel-Zanello. This includes the smallest example previously unknown, $h=(1,10,9,10,1)$. As M. Green's results depend heavily on the characteristic of the base field, so will ours. The appendix will contain a new argument, kindly provided to us by M. Green, for Theorems 3 and 4 of his paper, since we had found a gap in the original proof of those results during the preparation of this manuscript.

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