Does a wife get divorced if her husband swears to divorce her over a specific amount of money, and then it becomes clear that the amount is less than what he specified?

Divorce does not take effect if a person swears about something he believes he did, and then it turns out to be otherwise, because it is considered a laghw (idle/unintended) oath. This is because he did not deliberately utter falsehood but said it based on his assumption and belief that he was correct.