In the past week, it has happened twice that questions I have answered have been deleted, but I was unable to see them in the moderator tools. One question I was able to find (and attempt to undelete) via my cell phone, the other is still missing.
What is happening? Is this a bug or a feature?
In particular, a few hours ago I answered an interesting question about the density of regular languages containing the language of all squares. Now the question has vanished from sight, and I am unable to find any mention on it, although I both edited it and answered it. I suspect that this was a homework question, and the OP wanted to hide the fact that they got the answer on the web.
This kind of behavior is unacceptable, and I am especially disheartened by the stackexchange platform cooperating with it. Should I open a dummy account and upvote all my answers to prevent them from being deleted?
As a concrete feature, if a question I answered got deleted, shouldn't I, at the very least, get notified so that I can vote to undelete it?