I was tempted to put this in the Physics & Math forum, but I decided against it. Let m stand for a man and w stand for a woman. Because it's one man, m=1. Let m+w=M, where M is marriage. If men are equal to women, m=w, then the following two equations are true: m+m=M w+w=M There you go. Pure logic. Can't argue with pure logic. Discuss.