On invertible generating pairs of fundamental groups of graph manifolds
نویسندگان
چکیده
We study invertible generating pairs of fundamental groups of graph manifolds, that is, pairs of elements (g, h) for which the map g → g −1 , h → h −1 extends to an automorphism. We show in particular that a graph manifold is of Heegaard genus 2 if and only if its fundamental group has an invertible generating pair.
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