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Commutators in Free Products
(World Scientific Publishing, 1995)
Topological methods are used to show that for certain subgroups S of a free product F, if w∈S is a commutator in F, then w is a commutator in S.
Tesselations of S2 and equations over torsion-free groups
(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 ...