Radius problems for a subclass of close-to-convex univalent functions (Q1205611)

Let \(f\) and \(F\) be analytic in the unit disc. Then \(f\) is said to be in \(P[A,B]\) if \(f\) is subordinate to \((1+Az)/(1+Bz)\) where \(-1\leq B<A\leq 1\). Further, for \(0\leq\beta<1\), \(F\) is in \(K_ \beta^*[A,B]\) if there is a function \(g\) with \(zg'(z)/g(z)\) in \(P[A,B]\) such that \({\mathcal R}(zF'(z))'/g(z)>\beta\). These classes are related to other classes of univalent functions.