A Magnus theorem for some one-relator groups
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We will say that a group G possesses the Magnus property if for any two elements u,v in G with the same normal closure, u is conjugate to v or v^{-1}. We prove that some one-relator groups, including the fundamental groups of closed nonorientable surfaces of genus g>3 possess this property. The analogous result for orientable surfaces of any finite genus was obtained by the first author [Geometric methods in group theory, Contemp. Math, 372 (2005) 59-69].
This is the version published by Geometry & Topology Monographs on 29 April 2008. V2: typographical corrections
This is the version published by Geometry & Topology Monographs on 29 April 2008. V2: typographical corrections