Generic Initial Ideals And Graded Artinian Level Algebras Not Having The Weak-Lefschetz Property

Details Generic Initial Ideals And Graded Artinian Level Algebras Not Having The Weak-Lefschetz Property Generic Initial Ideals And Graded Artinian Level Algebras Not Having The Weak-Lefschetz Property

2006-07-03

arxiv.org/abs/math/0607035v1

Mathematics

Commutative Algebra

25 pages

Scientific paper

We find a sufficient condition that $\H$ is not level based on a reduction number. In particular, we prove that a graded Artinian algebra of codimension 3 with Hilbert function $\H=(h_0,h_1,..., h_{d-1}>h_d=h_{d+1})$ cannot be level if $h_d\le 2d+3$, and that there exists a level O-sequence of codimension 3 of type $\H$ for $h_d \ge 2d+k$ for $k\ge 4$. Furthermore, we show that $\H$ is not level if $\beta_{1,d+2}(I^{\rm lex})=\beta_{2,d+2}(I^{\rm lex})$, and also prove that any codimension 3 Artinian graded algebra $A=R/I$ cannot be level if $\beta_{1,d+2}(\Gin(I))=\beta_{2,d+2}(\Gin(I))$. In this case, the Hilbert function of $A$ does not have to satisfy the condition $h_{d-1}>h_d=h_{d+1}$. Moreover, we show that every codimension $n$ graded Artinian level algebra having the Weak-Lefschetz Property has the strictly unimodal Hilbert function having a growth condition on $(h_{d-1}-h_{d}) \le (n-1)(h_d-h_{d+1})$ for every $d > \theta$ where $$ h_0...>h_{s-1}>h_s. $$ In particular, we find that if $A$ is of codimension 3, then $(h_{d-1}-h_{d}) < 2(h_d-h_{d+1})$ for every $\theta< d 0 \quad \text{and} \quad \soc(A)_{d-1}=0 $$ for some $r_1(A)

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