On shrinking targets for piecewise expanding interval maps

For a map $T:[0,1]\rightarrow [0,1]$ with an invariant measure $\unicode[STIX]{x1D707}$ , we study, for a $\unicode[STIX]{x1D707}$ -typical $x$ , the set of points $y$ such that the inequality $|T^{n}x-y| is satisfied for infinitely many $n$ . We give a formula for the Hausdorff dimension of this set, under the assumption that $T$ is piecewise expanding and $\unicode[STIX]{x1D707}_{\unicode[STIX]{x1D719}}$ is a Gibbs measure. In some cases we also show that the set has a large intersection property.