On binomial complete intersections

• We consider homogeneous binomial ideals I=(f1,…,fn) in K[x1,…,xn], where fi=aixid−bimi and ai≠0. When such an ideal is a complete intersection, we show that the monomials which are not divisible by xid for i=1,…,n form a vector space basis for the corresponding quotient, and we describe the Macaulay dual generator in terms of a directed graph that we associate to I. These two properties can be seen as a natural generalization of well-known properties for monomial complete intersections. Moreover, we give a description of the radical of the resultant of I in terms of the directed graph.

Subject headings

NATURVETENSKAP  -- Matematik (hsv//swe)

NATURAL SCIENCES  -- Mathematics (hsv//eng)

Keyword

Binomial ideal

Complete intersection

Macaulay's inverse system

Resultant

Term-rewriting

Publication and Content Type

ref (subject category)

art (subject category)