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arXiv · 2311.02784

An algorithm to recognize echelon subgroups of a free group

Dario Ascari
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Abstract

We provide an algorithm that, given a finite set of generators for a subgroup $H$ of a finitely generated free group $F$, determines whether $H$ is echelon or not and, in case of affirmative answer, also computes a basis with respect to which $H$ is in echelon form. This answers to a question of A. Rosenmann. We also prove, by means of a counterexample, that intersection of two echelon subgroups needs not to be echelon, answering to another question of A. Rosenmann.

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Dario Ascari. 2023-11-05. An algorithm to recognize echelon subgroups of a free group. https://arxiv.org/abs/2311.02784

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