Structure of Whittaker groups and applications to conformal involutions on handlebodies (Q1957133)

A Whittaker group of rank \(g\) is a Kleinian group \(K\) containing, as an index two subgroup, a Schottky group of rank \(g\). The paper provides a geometric structural description of Whittaker groups by free products in the sense of the Klein-Maskit combination theorem. As an application of this construction, the authors obtain a number of facts concerning conformal involutions on handlebodies.