<Dl> <Dd> x y = x y (\ displaystyle (\ sqrt (xy)) = (\ sqrt (x)) (\ sqrt (y))) </Dd> </Dl> <Dd> x y = x y (\ displaystyle (\ sqrt (xy)) = (\ sqrt (x)) (\ sqrt (y))) </Dd> <Dl> <Dd> x = x 1 / 2 . (\ displaystyle (\ sqrt (x)) = x ^ (1 / 2).) </Dd> </Dl> <Dd> x = x 1 / 2 . (\ displaystyle (\ sqrt (x)) = x ^ (1 / 2).) </Dd>

Where did the square root symbol come from