I think it is not the case, but can deleted posts which were closed be reopened?

@user400188 You mean whether they can be reopened without getting undeleted?

At least I can confirm that the system allows me to cast a reopen vote. As an experiment, I tried to vote to reopen this question: math.stackexchange.com/questions/1885559/the-range-of-value

I guess it could be possible to search in SEDE for posts which were reopened before getting undeleted.

But SEDE seems to be down right now.

@MartinSleziak Thanks for the experiment, and the tip.

@user400188 See the revision history here. Deleted: Nov 7 '16, Reopened: Nov 10 '16, Undeleted: Nov 15 '16.

The query still returns some false positives, for questions which were deleted and undeleted more than once.

The query searches for posts where we can find D, R, U in the posts history in this order. But still, the post will also be returned by that query if the events went like this: D U R C D U. (The letters in bold show that the D, R, U pattern is still there.)

Here is another example of a post which was reopened while it was deleted: math.stackexchange.com/posts/2555009/revisions

I'm confused, this question was answered after it was closed, how is that technically possible? math.stackexchange.com/questions/3795286/…

@Sil There are certain race conditions which can make this possible. I believe that there is a meta post about this somewhere, but really don't have the time to go looking for it right now.

@XanderHenderson I see, author now said he started writing before it was closed, interesting bug

@XanderHenderson Perhaps you mean this: How was this answer posted after this question was closed? on Meta Stack Exchange.

@MartinR Yup. That seems to be the thing.

Thanks.

Why is it that people named "Martin" are so good as a librarians / curators of links?