AMA | October 2024

2385.313 - 2411.701 Sean Carroll

This is—in fact, you can prove it classically, and then you can go and show that in quantum mechanics there's a version of it that still works. But the principle of least action is based on the idea that we can consider the space of all possible paths or trajectories for some physical system— And then we can imagine the transformations that are enacted by a symmetry on those paths.