Semigroups of valuations dominating local domains

Details Semigroups of valuations dominating local domains Semigroups of valuations dominating local domains

2008-01-02

arxiv.org/abs/0801.0449v1

Mathematics

Commutative Algebra

Scientific paper

A new criterion is given for a semigroup to be the semigroup of a valuation dominating an equicharacteristic local domain. The criterion is used to construct examples of well ordered subsemigroups of the positive rational numbers which are of ordinal type omega, but are not the value semigroup of a valuation on an equicharacteristic noetherian local domain. This shows that the necessary conditions on value semigroups given in Appendix 3 to Zariski and Samuel's book ``Commutative Algebra'' are not sufficient.

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