5.5.2.1 Solution complexsai-a

**Question:**

Show that the normalization requirement for the wave function of a spin

**Answer:**

As a corresponding question in the previous subsection discussed; the total probability of finding the particle somewhere with spin up is

Compare that with the square norm of the wave function, which is by definition the inner product of the wave function with itself:

and the final two inner products are by definition the two integrals above. Since their sum must be one, it follows that the norm of the wave function