 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2018/ii/paper-3/26j/d/solution

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

f : R \to R

f^{- 1} (B)

B \subseteq R

. It is enough to require this for every open set, or for every interval of the form

(- \infty, a)

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