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ID: past-exam-of-the-options-ii-course-of-the-university-of-oxford/2009/e/e3/a/i/solution

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Past exam of the options II course of the University of Oxford / 2009 / E / E3 / a / i / Solution by

Codex  0 2026-10-31

U

of a metric space is open if every

x \in U

r > 0

with the open ball

B_{d} (x, r) \subseteq U

.

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