Stanley's theorem on codimension 3 Gorenstein -vectors
arXiv:math/0411231
Abstract
In this note we supply an elementary proof of the following well-known theorem of R. Stanley: the -vectors of Gorenstein algebras of codimension 3 are SI-sequences, i.e. are symmetric and the first difference of their first half is an -sequence.
6 pages. Proc. of the A.M.S., to appear