4:00 PM
The 30+ questions in the search below can probably be fixed my removing and adding : mathoverflow.net/questions/tagged/…

Thanks for retagging some questions in geometry tag.
@FrançoisG.Dorais I have noticed that the synonym $\to$ has been created. Perhaps it should be in some way marked in the relevant post that this is the way mods decided to go.
I will also point out that quid argued against this synonym. (In fact, based on they suggestion the analogous synonym was removed on math.SE.)

### Reappearance of (topology) tag

Jun 20 '16 at 13:55, 4 days total – 83 messages, 3 users, 2 stars

Bookmarked Jun 25 '16 at 9:09 by Martin Sleziak

Martin, I had read the discussion you and quid were having. I am fine with the idea of just killing off the tag if and when it appears. — Todd Trimble ♦ Jul 2 '16 at 11:30

@MartinSleziak It's a test. We'll see if problems arise.

I see.
So we will see what happens.
Since it is not a definitive decision, I take back my suggestion that it should be mentioned in the question about this on meta.
After your edits now there are only 1005 questions with deprecated tags. :-)
And questions with geometry tag without other geometry-related tag are now under 300: mathoverflow.net/questions/tagged/…

I had an idea to prevent reappearance of deprecated tags merge into and create a synonym. Thoughts?

4:19 PM
Maybe people would notice that the tag is deprecated in such case.
We will also see whether somebody will comment on the suggestion of tag-warning for geometry (and other deprecated tags).