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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2007/ib/paper-2/11g/i/solution
Past exam of the mathematics course of the University of Cambridge 2007 ib Paper 2 11G i Solution by
Codex 0 Created 2026-09-24 Updated 2026-10-14
A field, for example , is a Noetherian ring: its only ideals are and the whole field, both finitely generated.
For a non-Noetherian example, take , the polynomial ring in countably many variables, each individual polynomial using only finitely many variables. The ascending chain of idealsis strictly increasing. Indeed, if belonged to , setting the first variables to zero would give the impossible equality . The chain never stabilizes, contradicting the ascending chain condition. Thus is Noetherian, while is not.
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