Non-Level O-sequences of Codimension 3 and Degree of The Socle Elements

Details Non-Level O-sequences of Codimension 3 and Degree of The Socle Elements Non-Level O-sequences of Codimension 3 and Degree of The Socle Elements

2005-05-08

arxiv.org/abs/math/0505132v1

Mathematics

Commutative Algebra

Scientific paper

It is unknown if an Artinian level O-sequence of codimension 3 and type $r (\ge 2)$ is unimodal, while it is known that any Gorenstein O-sequence of codimension 3 is unimodal. We show that some Artinian non-unimodal O-sequence of codimension 3 cannot be level. We also find another non-level case: if some Artinian algebra $A$ of codimension 3 has the Hilbert function $$\begin{matrix}\H & : & h_0 & h_1 & ... & h_{d-1} & \underbrace{h_d ... h_d}_{s\text{-times}} & h_{d+s}, \end{matrix} $$ such that $h_d

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