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===== Postulates Prerequisites =====
Before this lesson, students should:
  * Understand the Stern-Gerlach experiment setup and know the results of the experiment.
  * Know that the spin-up and spin-down results of the Stern-Gerlach experiment with z-orientation are written in bra-ket notation as $\vert\: +\rangle $ and $\vert\: - \rangle$, respectively.
  * Have previous experience with polar coordinates.
  * Have previous exposure to Euler's identity and complex numbers in general.
  * Have the ability to use vectors and see how vectors and bra-ket notation are connected.



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