Epimorphisms between 2-bridge link groups: Homotopically trivial simple loops on 2-bridge spheres
Abstract
We give a complete characterization of those essential simple loops on 2-bridge spheres of 2-bridge links which are null-homotopic in the link complements. By using this result, we describe all upper-meridian-pair-preserving epimorphisms between 2-bridge link groups.
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