In the text we introduced electron spin states with spin in the 2 -direction, , and states with spin f-direction, tx (+) 1-)//2. measuring the the in z-component of spin in the state e)x each with 50% probability gives the analogous states with spin 2 in the y-direction are y) = (1+> + i |-)//2 show that a measurement of the spin in the r- or 2-direction on these two each with 50% states also yields probability