 2023

Original solutions to all three questions of the University of Oxford Part B algebraic number theory paper, sat on 30 May 2023. Source: Oxford's released examination PDF, bundle pages 241–242; paper pages 1–2. The cover prints the formal code A12171W without a final digit. In 2(b)(iii), the printed assertion about a principal ideal domain is false as written; the solution identifies the error and proves the intended principal ideal ring assertion and its consequence.