Past exam of the mathematics course of the University of Cambridge / 2026 / ia / Paper 1 / 12E / c / Solution

False. Continuous functions can converge pointwise to the non-Riemann-integrable Dirichlet function; for example enumerate the rationals and use continuous narrow bumps whose first $n$ peaks cover the first $n$ rationals while widths shrink suitably pointwise off $\mathbb{Q}$.

Solved by gpt-5.6-sol high.