12:42 AM
There already is tag. And was recently created. Synonym? Keep them separate? Remove?
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Let $A$ be a separable subset of a metric space $(M,d)$. Show that $\overline {A}$ is separable. Since $A$ is separable ,$A$ has a countable dense subset say $D$.But $\overline D=A$. I can't make $\overline D=\overline A$. What should I do? Please help me.

2 hours later…
2:44 AM
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Very often when I see a edited question made by another person, I see that the editor didn't change the wrong tag, for example, it's very typical that questions about high school algebra are tagged with linear algebra or abstract algebra. Other times I see that the editor hasn't added a correct t...