Sorry for the dumb question, I'm not good at mathematics, but: what is 1/i ? 1/i * 1/i = 1*1 / (i*i) = 1/-1 = -1 ??? If so the number, 1/i has the property that (1/i)^2 = -1 which is the definition of i. BUT, 1/i is not equal to i because if it did: 1/i * i would be i*i= -1 however, 1/i * i = i / i = 1 ??? So can someone explain what's going on? Where did I make the mistake(s)? Thanks!