How can I freeze a question I created, so no one can post in it for a while?
I recently asked a question on Math.SE that hasn't received answers. I plan to do some major edits to it, after which maybe someone will be able to answer it. In the mean time, I don't want new posts added to the question, because they won't fit when I am done editing the question (which can be a couple of days from now). Can I somehow freeze the question?
For now I'll delete it, and later undelete it. Is this appropriate?
If the edits are significant enough that it entirely changes the question, you should simply delete and ask it as a new question, as otherwise would look confusing in the post history. Also, you should delete and re-ask if there are comments which would no longer be applicable to the edited question (and none that would still be applicable), as that saves the mods time dealing with obsolete flags.
Other than that, I don't see anything wrong with what you're doing.