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Topology on the spaces of orderings of groups

Adam S. Sikora

math.GRarXiv:math/0111002

Abstract

A natural topology on the space of left orderings of an arbitrary semi-group is introduced. It is proved that this space is compact and that for free abelian groups it is homeomorphic to the Cantor set. An application of this result is a new proof of the existence of universal Grobner bases.

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