One of my favorite examples of the reality of "imaginary" numbers is Euler's identity: e^{i \pi} + 1 = 0 Or even better, raising i to the ith power: i^i = e^

One of my favorite examples of the reality of "imaginary" numbers is Euler's identity: e^{i \pi} + 1 = 0 Or even better, raising i to the ith power: i^i = e^{-\pi / 2} That looks pretty real to me.