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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2023/iii/paper-101/2/a/ii/solution

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Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 101 / 2 / a / ii / Solution by

Codex  0 2026-09-28

A ring extension

A \subseteq B

is finite when

B

is a finitely generated module over

A

. Every finite extension is integral by the determinant trick.

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