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Fully Preorderable Groups

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Abstract

We say that a group is fully preorderable if every (left- and right-) translation invariant preorder on it can be extended to a translation invariant total preorder. Such groups arise naturally in applications, and relate closely to orderable and fully orderable groups (which were studied extensively since the seminal works of Philip Hall and A. I. Mal’cev in the 1950s). Our first main result provides a purely group-theoretic characterization of fully preorderable groups by means of a condition that goes back to Ohnishi (Osaka Math. J. 2, 161–164 16). In particular, this result implies that every fully orderable group is fully preorderable, but not conversely. Our second main result shows that every locally nilpotent group is fully preorderable, but a solvable group need not be fully preorderable. Several applications of these results concerning the inheritance of full preorderability, connections between full preorderability and full orderability, vector preordered groups, and total extensions of translation invariant binary relations on a group, are provided.

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Correspondence to Efe A. Ok.

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The comments of Andrew Glass, Andrés Navas, Cristóbal Rivas and an anonymous referee of this journal have improved the content of this work; we gratefully acknowledge our intellectual debt to them. This paper is in final form and no version of it will be submitted for publication elsewhere.

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Ok, E.A., Riella, G. Fully Preorderable Groups. Order 38, 127–142 (2021). https://doi.org/10.1007/s11083-020-09532-5

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  • DOI: https://doi.org/10.1007/s11083-020-09532-5

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