The Direct Summand Conjecture in Dimension Three

Details The Direct Summand Conjecture in Dimension Three The Direct Summand Conjecture in Dimension Three

2002-10-15

arxiv.org/abs/math/0210223v1

Mathematics

Commutative Algebra

14 pages, no figues

Scientific paper

The direct summand conjecture asserts that if R is a regular local ring and S is a module-finite R-algebra containing R, then R is a direct summand of S as an R-module. It was previously known to be true if R contains a field or if dim R is at most two. In this article, the result is demonstrated for mixed characteristic rings of dimension three. The proof is accomplished by showing that an extension of plus closure has the colon-capturing property in dimension three.

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