Mathematics – Commutative Algebra
Scientific paper
2010-01-19
Mathematics
Commutative Algebra
15 pages
Scientific paper
10.1007/978-3-642-19492-4
We describe the positive cone generated by bigraded Betti diagrams of artinian modules of codimension two, whose resolutions become pure of a given type when taking total degrees. If the differences of these total degrees, p and q, are relatively prime, the extremal rays are parametrised by order ideals in N^2 contained in the region px + qy < (p-1)(q-1). We also consider some examples concerning artinian modules of codimension three.
Boij Mats
Floystad Gunnar
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