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Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 101 / 1 / ii / a

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2024 iii Paper 101 1 ii
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a
The statement is true. If M is generated by m1​,…,mr​, there is a surjection Rr↠M. The right exactness of the tensor product of modules gives a surjection
Nr≅Rr⊗R​N↠M⊗R​N.
(1)
A finite direct sum of Noetherian modules is Noetherian, and a quotient of a Noetherian module is Noetherian. Hence M⊗R​N is Noetherian.

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