Tight closure and plus closure for cones over elliptic curves

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We characterize the tight closure of graded primary ideals in a homogeneous coordinate ring over an elliptic curve by numerical conditions and we show that it is in positive characteristic the same as the plus closure.
Some minor changes

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Commutative Algebra, Algebraic Geometry, 13A35; 14H60, 14H52, 14M20, 14C20

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http://salesiana.dossiersoluciones.com/handle/123456789/65043

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0209302
 http://arxiv.org/abs/math/0209302
 Nagoya Math. Journal, 177 (2005)

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arXiv