Valuations centered at a two-dimensional regular local domain: infima and topologies

  • Josnei Novacoski

    University of Silesia, Katowice, Poland
Valuations centered at a two-dimensional regular local domain: infima and topologies cover
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Abstract

Take a two-dimensional regular local domain . The space of all valuations centered at has a non-metric tree structure, called the valuative tree of . However, the notion of non-metric tree appearing in the literature does not guarantee the existence of infimum for a non-empty set of valuations. We give a more general definition of a rooted non-metric tree and prove that the valuative tree has this more general property. We also generalize some topological results related to a non-metric tree. For instance, we show that the weak tree topology is always coarser than the metric topology given by any parametrization.