Exercise 8.15: Spin One-Half Particle | Mike F's Phys 4241

[ehrenfest]

Homework Statement

http://mikef.org/files/phys_4241_hw19.pdf
I am having trouble figuring out why the imaginary solutions to the differential equation were thrown out in Exercise 8.15.

Homework Equations

The Attempt at a Solution

 

[Dick]

The didn't throw out any imaginary solutions. The just wrote the solutions in terms linear combinations of real solutions. The coefficients can always be complex.