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A Bass--Serre theoretic proof of a theorem of Burns and Romanovskii

Published 6 Jul 2021 in math.GR | (2107.02548v1)

Abstract: A well known theorem of Burns and Romanovskii states that a free product of subgroup separable groups is itself subgroup separable. We provide a proof using the language of immersions and coverings of graphs of groups, due to Bass.

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