See also Feynman’s Derivation of the Schrödinger Equation discussed a couple of weeks ago...<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10974803" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10974803</a>