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On proximity relations for valuations dominating a two-dimensional regular local ring.

José J. AparicioAngel GranjaTomás Sánchez-Giralda — 1999

Revista Matemática Iberoamericana

The purpose of this paper is to define a new numerical invariant of valuations centered in a regular two-dimensional regular local ring. For this, we define a sequence of non-negative rational numbers δ = {δ(j)} which is determined by the proximity relations of the successive quadratic transformations at the points determined by a valuation ν. This sequence is characterized by seven combinatorial properties, so that any sequence of non-negative rational numbers having the above properties is the...

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