I think the easiest mathematical example would probably be something along the lines of: "I've managed to solve for X, Y and Z!" "So did I, but I don't believ

I think the easiest mathematical example would probably be something along the lines of: "I've managed to solve for X, Y and Z!" "So did I, but I don't believe you. Prove it to me." "The sum of all the digits in X, Y and Z is 143"