I don't think my son appreciated the idea of a #IntegrationBee (based on the groan) but I thought these were a nice end of chapter set of problems.

Join us for the Oxford Integration Bee in L1 at the Maths Institute this Wednesday. Cash prizes and free pizza. #invariants #IntegrationBee
read more on our website https://www.invariants.org.uk/2023/02/oxford-integration-bee/