Semifree actions of free groups

Archive for Mathematical Logic 46 (2):93-105 (2007)
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Abstract

We study countable universes similar to a free action of a group G. It turns out that this is equivalent to the study of free semi-actions of G, with two universes being transformable iff one corresponding free semi-action can be obtained from the other by a finite alteration. In the case of a free group G (in finitely many or countably many generators), a classification is given

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10.1007/s00153-006-0029-8

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