Relative Riemann-Zariski spaces

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Abstract

In this paper we study relative Riemann-Zariski spaces associated to a morphism of schemes and generalizing the classical Riemann-Zariski space of a field. We prove that similarly to the classical RZ spaces, the relative ones can be described either as projective limits of schemes in the category of locally ringed spaces or as certain spaces of valuations. We apply these spaces to prove the following two new results: a strong version of stable modification theorem for relative curves; a decomposition theorem which asserts that any separated morphism between quasi-compact and quasiseparated schemes factors as a composition of an affine morphism and a proper morphism. In particular, we obtain a new proof of Nagata's compactification theorem.

Original languageAmerican English
Pages (from-to)1-42
Number of pages42
JournalIsrael Journal of Mathematics
Volume185
Issue number1
DOIs
StatePublished - Oct 2011

All Science Journal Classification (ASJC) codes

  • General Mathematics

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