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Right-angled Artin subgroups of right-angled Coxeter and Artin groups

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arxiv 2003.05531 v2 pith:WRPUKAC4 submitted 2020-03-11 math.GR math.GT

classification math.GRmath.GT
keywords raagright-angledartingroupsraagsracgssubgroupscommensurable
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We determine when certain natural classes of subgroups of right-angled Coxeter groups (RACGs) and right-angled Artin groups (RAAGs) are themselves RAAGs. We characterize finite-index visual RAAG subgroups of 2-dimensional RACGs. As an application, we show that any 2-dimensional, one-ended RACG with planar defining graph is quasi-isometric to a RAAG if and only if it is commensurable to a RAAG. Additionally, we give new examples of RACGs with non-planar defining graphs which are commensurable to RAAGs. Finally, we give a new proof of a result of Dyer: every subgroup generated by conjugates of RAAG generators is itself a RAAG.

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  1. Subgroups of right-angled Coxeter groups via Stallings-like techniques

    math.GT 2019-08 conditional novelty 8.0 of 10

    A subgroup of a right-angled Coxeter group is quasiconvex exactly when its constructed completion complex is finite, and this yields new algorithmic tests for subgroup properties and finite-index embeddability.

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