Prove that if a topology ? has a countable subbase, then it also has a countable...

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Prove that if a topology ? has a countable subbase, then it also has a countable...

Prove that if a topology $\tau$ ? has a countable subbase, then it also has a countable base.

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Prove that if a topology ? has a countable subbase, then it also has a countable...

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