weirdwallace75, 2 years ago

Noether's Theorem:

https://en.wikipedia.org/wiki/Noether%27s_theorem

https://math.ucr.edu/home/baez/noether.html

Fundamentally, it allows us to logically infer the conservation laws from the laws of motion of a given physical system using relatively simple math. It always applies, no matter if we're talking about massive systems or quantum ones.