The structure of the core of ideals

Alberto Corso, Claudia Polini, Bernd Ulrich

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The core of an R-ideal I is the intersection of all reductions of I. This object was introduced by D. Rees and J. Sally and later studied by C. Huneke and I. Swanson, who showed in particular its connection to J. Lipman's notion of adjoint of an ideal. Being an a priori infinite intersection of ideals, the core is difficult to describe explicitly. We prove in a broad setting that: core(I) is a finite intersection of minimal reductions; core(I) is a finite intersection of general minimal reductions; core(I) is the contraction to R of a 'universal' ideal; core(I) behaves well under flat extensions. The proofs are based on general multiplicity estimates for certain modules.

Original languageEnglish
Pages (from-to)89-105
Number of pages17
JournalMathematische Annalen
Issue number1
StatePublished - 2001

ASJC Scopus subject areas

  • General Mathematics


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