What systems can the Principle of Least Action be applied?
44282
How do I show that there exists variational/action principle for a given classical system?
87125
Does action really have to be Lorentz-invariant in SR?
35181
Integrals of Motion
145451
Limit position rigidbody
115224
Equivalences of $\diamondsuit$-principle.
116417
Method of Steepest Descent and Lagrange
47384
Huygens-principle
42036
Why should an action integral be stationary? On what basis did Hamilton state this principle?
88658
Confusion regarding the principle of least action in Landau & Lifshitz "The Classical Theory of Fields"
125467
What is an example of the Liskov Substitution Principle?
157321
Why does the action have to be hermitian?
84382
Sole minimal element: Why not also the minimum?
95759
Lower Semicontinuity Concepts
129399
Maximum module principle
149283
What overpowered combinations would be available if I allow a bonus action to be used in place of a standard action?
77574
Action economies, two-handed weapons, and spells with Somatic components
39208
What identifies an action-reaction pair of forces?