%0 Journal Article
%T The cone of Betti diagrams of bigraded artinian modules of codimension two
%A Mats Boij
%A Gunnar Floystad
%J Mathematics
%D 2010
%I arXiv
%R 10.1007/978-3-642-19492-4
%X 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.
%U http://arxiv.org/abs/1001.3238v1