Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 203 / 4 / a

The law satisfies the chordal restriction property when, for every $A\in {\mathcal{Q}}_{\pm }$, conditional on $\gamma \cap A=\varnothing$, the mapped curve ${\psi }_A(\gamma )$ has the same unparameterized law as $\gamma$ in $(\mathbb{H},0,\infty )$.