It is Lagrange Mechanics that is great. L - V that means something and that is odd, unlike L + V the Hamiltonian which is conservation of energy. It is used al

It is Lagrange Mechanics that is great. L - V that means something and that is odd, unlike L + V the Hamiltonian which is conservation of energy. It is used also in quantum field theory due to its treatment of time, unlike Hamilton. That is very strange. But it works. Also, the principle of action is so odd (sort of Feynman Diagram but in classical world) you really just have to believe it instead of thinking too hard on it.