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This article is cited in 12 scientific papers (total in 12 papers)
On the Factoriality of Cox rings
I. V. Arzhantsev M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics
Abstract:
The generalized Cox construction associates with an algebraic variety a remarkable invariant — its total coordinate ring, or Cox ring. In this note, we give a new proof of the factoriality of the Cox ring when the divisor class group of the variety is finitely generated and free. The proof is based on the notion of graded factoriality. We show that if the divisor class group has torsion, then the Cox ring is again factorially graded, but factoriality may be lost.
Keywords:
total coordinate ring, Cox ring, algebraic variety, factorial ring, graded factoriality, divisor class group, torsion, Weil divisor, Cartier divisor.
Received: 05.02.2008
Citation:
I. V. Arzhantsev, “On the Factoriality of Cox rings”, Mat. Zametki, 85:5 (2009), 643–651; Math. Notes, 85:5 (2009), 623–629
Linking options:
https://www.mathnet.ru/eng/mzm6907https://doi.org/10.4213/mzm6907 https://www.mathnet.ru/eng/mzm/v85/i5/p643
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