There are three umpires at a baseball game. One is an engineer, one is
a physicist and one is a mathematician. There is a close play at home
plate and all three umpires call the man out. The manager runs out of the
dugout and asks each umpire why the man was called out.

The physicist says, Hes out because I calls em as I sees em.

The engineer says, Hes out because I calls em as they are.

The mathematician says, Hes out because I called him out.