Common mistake: both parties make the same mistake; each is mistaken about the same fundamental fact.
Mutual mistake: both parties are mistaken but they have made different mistakes; they are at cross purposes.
Unilateral mistake: only one of the parties is mistaken and the other party either knows of his mistake or is taken to know of it. Often, one party seeks to take advantage of the other party's mistake.
Comments
No comments have yet been made