Past exam of the mathematics course of the University of Cambridge 2026 iii Paper 101 4 c ii Solution Created 2026-09-24 Updated 2026-10-03
Yes. Scalar multiplication in the quotient module gives directlyHence the displayed filtration is precisely the induced filtration.
Prime filtration 2026-10-06
A prime filtration of a module over a commutative ring is a finite increasing chain from zero to the module with each nonzero successive quotient module isomorphic to for a prime ideal . Every finitely generated module over a Noetherian ring has one. In each nonzero quotient, a maximal annihilator of a module element is prime supplies a cyclic submodule ; lift it and repeat. The ascending chain condition for a Noetherian module makes the process terminate. This is not necessarily a composition series: the prime ideals need not be maximal.