Published online by Cambridge University Press: 01 June 2015
Let   $G,H$  be two Kleinian groups with homeomorphic quotients
 $G,H$  be two Kleinian groups with homeomorphic quotients   $\mathbb{H}^{3}/G$  and
 $\mathbb{H}^{3}/G$  and   $\mathbb{H}^{3}/H$ . We assume that
 $\mathbb{H}^{3}/H$ . We assume that   $G$  is of divergence type, and consider the Patterson–Sullivan measures of
 $G$  is of divergence type, and consider the Patterson–Sullivan measures of   $G$  and
 $G$  and   $H$ . The measurable rigidity theorem by Sullivan and Tukia says that a measurable and essentially directly measurable equivariant boundary map
 $H$ . The measurable rigidity theorem by Sullivan and Tukia says that a measurable and essentially directly measurable equivariant boundary map   $\widehat{k}$  from the limit set
 $\widehat{k}$  from the limit set   $\unicode[STIX]{x1D6EC}_{G}$  of
 $\unicode[STIX]{x1D6EC}_{G}$  of   $G$  to that of
 $G$  to that of   $H$  is either the restriction of a Möbius transformation or totally singular. In this paper, we shall show that such
 $H$  is either the restriction of a Möbius transformation or totally singular. In this paper, we shall show that such   $\widehat{k}$  always exists. In fact, we shall construct
 $\widehat{k}$  always exists. In fact, we shall construct   $\widehat{k}$  concretely from the Cannon–Thurston maps of
 $\widehat{k}$  concretely from the Cannon–Thurston maps of   $G$  and
 $G$  and   $H$ .
 $H$ .