NORTHEASTERN UNIVERSITY
MATHEMATICS DEPARTMENT

REPRESENTATION THEORY AND RELATED TOPICS SEMINAR


Oana Veliche

(Northeastern University)

  On the Index of Numerical Semigroup Rings
of Embedding Dimension Three

ABSTRACT: The index of a local Gorenstein ring,  defined by Auslander and studied by  Ding  in his thesis, is the least power of the maximal ideal with the property that the  Auslander delta invariant of the cyclic module defined by it is nonzero.  For a Gorenstein numerical semigroup ring of embedding dimension three, a complete formula of the index, in terms of the generators of the semigroup, is given.The talk will discuss the proof and some applications.

October 14, 2011
11:00 - 12:00
(Notice unusual time)
511 Lake Hall

For further information visit http://www.northeastern.edu/martsinkovsky/p/rtrt.html  or contact Alex Martsinkovsky alexmart >at< neu >dot< edu