Tight closure and plus closure for cones over elliptic curves

Abstract

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

Cited by in corpus (2)

• Slopes of vector bundles on projective curves and applications to tight closure problems
• Tight closure and projective bundles