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Tesselations of S2 and equations over torsion-free groups

Clifford, Andrew; Goldstein, Richard Z. (Cambridge University Press, 1995)

Let G be a torsion free group, F the free group generated by t. The equation r(t) = 1 is said to have a solution over G if there is a solution in some group that contains G. In this paper we generalize a result due to ...