Kindle No. 734 > Equation of |A|^2
Kindle version (typo)
|A|^2 = A \dot{} A^* = (a cos a + ia sin a)(a cos a - ia sin a) = a^2
printed book (correct)
|A|^2 = A \dot{} A^* = (a cos \alpha + ia sin \alpha)(a cos \alpha - ia sin \alpha) = a^2
(mistake between a and alpha)