Suppose $X$ is a metric space . If $X$ happens to be separable ,then countably many open subsets are enough to form a base. How to prove this one?
Any suggestion will be appreciated.
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True. How to delete it or close it – Bluey Jun 05 '18 at 14:46
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I think you can find the option under the body of the question – Guillermo Mosse Jun 05 '18 at 15:12