I'm wondering what was the reason for the moderator Asaf Karagila deleted this question: https://math.stackexchange.com/questions/4088822
I know the question is a problem in the last AMM issue for the simple reason that I was the one who found this out few hours after posting the answer. But AMM's questions are not part of a contest, so they are public and can be solved by anyone, I guess. Is there a rule for not posting AMM's problems until they are solved in the journal?
As the moderator closed the question without any explanation I'm wondering about the reasons.
Edit. Martin Sleziak reformulated my question in a better way: if a question is a problem in a journal does it fall under contest problem policy?