I have a setup where theorems are numbered automatically. Now I want a single theorem be numbered with special number, e.g. after Theorem 2 write Theorem 2'. Is it possible?
I can't comment yet so if some that can change this answer to a comment sees it feel free to do so.
I believe your question is a possible duplicate of How do I make a Theorem n followed by a Theorem n' ?.
You should see if this question also answers yours