Let H be a connected hereditary abelian category over an algebraically closed field k, with finite dimensional homomorphism and extension spaces. There are two main known types of such categories: those derived equivalent to mod lambda for some finite dimensional hereditary k-algebra lambda and those derived equivalent to some category coh X of coherent sheaves on a weighted projective line X in the sense of Geigle and Lenzing (1987). The aim of this paper is to give a characterization of the second class in terms of some properties known to hold for these hereditary categories. [References: 15]
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