I have asked a question and it has turned out to be useless. I misunderstood the statement of a theorem and that is why my doubt was absurd. The question does not contribute anything and the moderators have not deleted it, but a user has answered it and has obtained a few upvotes for the answer. Should I delete it (and how)?
Edit: the question is here. Finally, I have decided to add to the question an answer in which I prove the result that led me to confusion. I think this, together with the clarification of the statement that I misunderstood, makes the question useful.