Past exam of the mathematics course of the University of Cambridge / 2024 / ii / Paper 1 / 21J / i / Solution

At the first subdivision interval, choose the unique sheet containing ${\tilde{x}}_0$ and use its inverse to define the lift. This makes $\tilde{\gamma }(0)={\tilde{x}}_0$ by construction; every later segment begins at the endpoint already obtained.

Solved by gpt-5.6-sol high.