Invariance of Euler-Lagrange equation
126390
Covariance of Euler-Lagrange equations under change of generalized coordinates
64247
Noether Theorem and Energy conservation in classical mechanics
62816
Proof that ODE solutions with Wronskian identically zero are linearly dependent
56911
Proving invariance of $ds^2$ from the invariance of the speed of light
4196
A valid proof for the invariance of domain theorem?
12949
Inductive Proof of Euler's Formula $v-e+r=2$
4421
Proof that total derivative is the only function that can be added to Lagrangian without changing the EOM
89580
Bernoulli's equation and reference frames
154454
Why are $L_4$ and $L_5$ lagrangian points stable?
51294
Derivation of Euler's equations for rigid body rotation
22279
Local and Global Symmetries
35298
A question about the higher-order Weyl variation for the geodesic distance
44282
How do I show that there exists variational/action principle for a given classical system?
59409
Show Laplace operator is rotationally invariant
85094
A problem from Evans' PDEs book: find a Lagrangian for a given Euler-Lagrange equation
99194
Scale invariance symmetry as a simple argument in an electrostatics problem
17414
Lagrangian of an effective potential