Finding the Symmetries of Action/Lagrangian
69199
How to find the continuous transformations which leave the action invariant?
121914
Unitary representations of the diffeomorphism group in curved spacetime
66939
Picturing the how the covariant derivative acts on vector fields
105660
Invariance of action $\Rightarrow$ covariance of field equations?
27300
Is there a 1-1 correspondence between symmetry and group theory?
81188
$SO(3)$, orbital angular momentum, vector product
44747
Finding the effective Hamiltonian in a certain subspace
35248
Getting started with Lie Groups
33868
A transformation between two free group actions.
82135
Lagrangian to Hamiltonian in Quantum Field Theory
82166
How are constraint forces represented in Lagrangian mechanics?
70880
Invariance of canonical Hamiltonian equation when adding the total time derivative of a function of $q_i$ and $t$ to the Lagrangian
10953
Elementary argument for conservation laws from symmetries *without* using the Lagrangian formalism
83917
How can I prove that the following Lagrangian is Lorentz-invariant iff the axionic field is a pseudoscalar?
153050
Variation of Action with time coordinate variations
60436
How are symmetries precisely defined?
105572
Independent Variables of a Lagrangian