Do the same equations of motion imply the same Lagrangians?
4421
Proof that total derivative is the only function that can be added to Lagrangian without changing the EOM
1031
When does Hamiltonian equals to energy of the system?
46053
How to find Hamiltonian from this simple Lagrangian? (tricky)
112209
Landau's argument for dependence of Lagrangian on magnitude of velocity
158526
Finding a "Principle of Least Action" equivalent statement for Hamiltonian Mechanics
82166
How are constraint forces represented in Lagrangian mechanics?
101888
Least action principle : is $ \delta \frac{dx}{dt} = \frac{d \delta x}{dt} $ always true?
89479
Galilean invariance of a subset of Maxwell equations
44282
How do I show that there exists variational/action principle for a given classical system?
28935
Lagrangian of the Euler equations
17414
Lagrangian of an effective potential
35509
Noether's Theorem: Lie groups vs. Lie algebras; finite vs. infinitesimal symmetries
61142
Is there any physics that cannot be expressed in terms of Lagrange equations?
4989
Why are there only derivatives to the first order in the Lagrangian?
64727
Total time derivatives and partial coordinate derivatives in classical mechanics
156234
Why is the Converse to Lagrange's Theorem False?
126142
Action principle, Lagrangian mechanics, Hamiltonian mechanics, and conservation laws when assuming Aristotelian mechanics $F=mv$