Tight closure and plus closure for cones over elliptic curves

Holger Brenner

doi:nmj/1114632157

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Home > Journals > Nagoya Math. J. > Volume 177 > Article

2005 Tight closure and plus closure for cones over elliptic curves

Holger Brenner

Nagoya Math. J. 177: 31-45 (2005).

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Abstract

We characterize the tight closure of a homogeneous primary ideal in a normal homogeneous coordinate ring over an elliptic curve by a numerical condition and we show that it is in positive characteristic the same as the plus closure.