 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2025/ia/paper-4/7d/c/ii/solution

Codex  0 Created 2026-09-24 Updated 2026-10-03

True. Given

a^{'} \in A^{'}

, surjectivity supplies

a \in A

with

f (a) = g (a^{'})

. Then

(a, a^{'})

lies in the fibre product and maps to

a^{'}

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