It was Keane who first showed that Riesz products can be regarded as strong mixing
invariant measure under the
shift operator S(x) = mx\, \bmod\, 1. These were later generalized by Brown and Dooley to Riesz products of the form : \prod_{k=1}^\infty \left( 1 + r_k \cos(2 \pi m_1m_2\cdots m_k t) \right) where -1 . ==References ==