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6:09 AM
10975564: Just for the case that we indeed remove the tag.
I am copying here tag excerpt (created by Willie Wong), so that it is not lost in such case.
A relation $\square$ is reflexive if $A \square B \iff B \square A$. For example, the relation "equals to" on integers is reflexive, but the relation "less than" is not.
At the moment, there are 4 questions having this tag:
 
 
6 hours later…
12:18 PM
I have removed tag from all question where it was used.
If someone consider the tag useful, it should be easy to restore the current status from the information I copied above.
 
 
1 hour later…
1:29 PM
I've added tag-excerpt and tag-wiki to [tag:separation axioms].
Tag-excerpt: Separation axioms are properties of topological space which, roughly speaking, say in what way can be two points, a point and a closed set or two points be "separated".
Tag-wiki:
Separation axioms are properties of topological space which, roughly speaking, say in what way can be two points, a point and a closed set or two points be "separated".
The most important separation axioms are $T_0$-spaces, $T_1$-spaces, Hausdorff, regular, completely regular (also known as Tychonoff) and normal spaces.
I'll be very glad if someone improves the tag-excerpt and the tag-wiki.
A natural question is whether we want tag.
I am not entirely sure, but perhaps it might be useful. The tags and are, to some extent, similar.
 

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