Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4597612 | Journal of Pure and Applied Algebra | 2010 | 15 Pages |
Abstract
Suppose that k is an arbitrary field. Let k[[x1,â¦,xn]] be the ring of formal power series in n variables with coefficients in k. Let k¯ be the algebraic closure of k and Ïâk¯[[x1,â¦,xn]]. We give a simple necessary and sufficient condition for Ï to be algebraic over the quotient field of k[[x1,â¦,xn]]. We also characterize valuation rings V dominating an excellent Noetherian local domain R of dimension 2, and such that the rank increases after passing to the completion of a birational extension of R. This is a generalization of the characterization given by M. Spivakovsky [Valuations in function fields of surfaces, Amer. J. Math. 112 (1990) 107-156] in the case when the residue field of R is algebraically closed.
Related Topics
Physical Sciences and Engineering
Mathematics
Algebra and Number Theory
Authors
Steven Dale Cutkosky, Olga Kashcheyeva,