The canonical module of a Cox ring

Details The canonical module of a Cox ring The canonical module of a Cox ring

2010-07-20

arxiv.org/abs/1007.3327v3

Mathematics

Algebraic Geometry

19 pages, corrected minor errors and updated the references

Scientific paper

In this paper, we shall describe the graded canonical module of a Noetherian multi-section ring of a normal projective variety. In particular, in the case of the Cox ring, we prove that the graded canonical module is a graded free module of rank one with the shift of degree $K_X$. We shall give two kinds of proofs. The first one utilizes the equivariant twisted inverse functor developed by the first author. The second proof is down-to-earth, that avoids the twisted inverse functor.

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