Given equations of motion, how can we check if there is a lagrangian from which we can derive them?
44282
How do I show that there exists variational/action principle for a given classical system?
62692
Retrieving Maxwell's equations from the minimum action principle
35181
Integrals of Motion
11358
Eigenvalues of the Lagrangian?
66919
When/why does the principle of least action plus boundary conditions not uniquely specify a path?
10953
Elementary argument for conservation laws from symmetries *without* using the Lagrangian formalism
99789
Beyond Hamiltonian and Lagrangian mechanics
13644
Is the change in the Lagrangian always a total derivative for symmetry transformations of the action?
43492
When motion begins, do objects go through an infinite number of position derivatives?
120474
Does the lagrangian contain all the information about the representations of the fields in QFT?
114672
Why do we use the Lagrangian and Hamiltonian instead of other related functions?
100487
How to derive relation for time derivative in a rotating reference frame
68813
Geodesic Equation from variation: Is the squared lagrangian equivalent?
65478
Operational definitions in Newtonian Physics
37598
Deriving the Lorentz force from velocity dependent potential
146853
Do we need inertial frames in Lagrangian mechanics?
77338
Lagrangian interpolation: degree of the interpolation polynomial