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Algebra Logika, 2003 Volume 42, Number 4, Pages 497–509 (Mi al41)

Convex Subgroups of Partially Right-Ordered Groups

A. M. Protopopov


Abstract: We study into the question of whether a partial order can be induced from a partially right-ordered group $G$ onto a space $R(G:H)$ of right cosets of $G$ w.r.t. some subgroup $H$ of $G$. Examples are constructed showing that the condition of being convex for $H$ in $G$ is insufficient for this. A necessary and sufficient condition (in terms of a subgroup $H$ and a positive cone $P$ of $G$) is specified under which an order of $G$ can be induced onto $R(G:H)$. Sufficient conditions are also given. We establish properties of the class of partially right-ordered groups $G$ for which $R(G:H)$ is partially ordered for every convex subgroup $H$, and properties of the class of groups such that $R(G:H)$ is partially ordered for every partial right order $P$ on $G$ and every subgroup $H$ that is convex under $P$.

Keywords: partially right-ordered group, convex subgroup.

UDC: 512.54

Received: 27.10.2001
Revised: 17.02.2002


 English version:
Algebra and Logic, 2003, 42:4, 279–286

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