What is the ruling on a man who made his wife's divorce contingent upon her leaving the house without his permission, by saying: "If you leave without my permission, then you are divorced," and she left, having forgotten the oath?

"As long as the woman went out without her husband's permission, forgetting that divorce was conditioned upon her not going out without his permission, then there is a difference of opinion among scholars regarding whether divorce occurs. If the woman performs the conditioned act out of forgetfulness, there are two opinions. The opinion that divorce does not occur in this situation is a strong one, chosen by some verifying scholars."