Schrödinger equation

Harvey had a tattoo of Schrödinger equation for the wave function of the particle.

It began with $$\frac{8π^{2}}{h^{2}}$$. (AUDIO: The Big Blue Book)

Behind the scenes
Described succinctly, the Schrödinger equation, developed by Erwin Schrödinger in 1926, is a partial differential equation that describes how a non-relativistic quantum state evolves over time.