Where did we get that [Schrödinger&#x27;s equation] from? It&#x27;s not possible to derive it from anything you know. It came out of the mind of Schrödinger.
-The Feynman Lectures on Physics<p>For anyone who wants to study quantum mechanics and has a math background, I strongly recommend Shankar&#x27;s quantum textbook. It has the most rigorous, clear, and correct derivations I have seen thus far, starting with vector spaces and moving to physical systems only after a hundred or so pages.