The principle of least action
18054
Is there a proof from the first principle that the Lagrangian L = T - V?
91281
Proving the so-called "Well Ordering Principle"
19783
Why does a system try to minimize potential energy?
6874
smallest value of $k$ for which $a_k$ is $0$
107595
Iteratively minimizing the function
112398
Proof that the effective/proper action is the generating functional of one-particle-irreducible (1PI) correlation functions
98372
Proof of the principle of backwards induction
126142
Action principle, Lagrangian mechanics, Hamiltonian mechanics, and conservation laws when assuming Aristotelian mechanics $F=mv$
106538
Why are thermodynamic potentials minimised?
48930
Least-action classical electrodynamics without potentials
138720
Minimum principle in Hilbert space
157321
Why does the action have to be hermitian?
121920
Can there be multiple paths for which Fermat's least time principle can be obeyed?
84382
Sole minimal element: Why not also the minimum?
91516
Procedure for reducing the degrees of freedom of an arbitrary system
116033
Energy conservation limited by uncertainty principle
24478
What is the name of this theorem, and are there any caveats?