Invariance of Lagrangian under Poincaré group transformations implies covariant Lagrange equations?
105660
Invariance of action $\Rightarrow$ covariance of field equations?
34788
Lagrangian for relativistic massless point particle
114562
Boundary conditions for calculus of variations in phase space and under canonical transformations
66939
Picturing the how the covariant derivative acts on vector fields
27490
Group Theory in General Relativity
119794
Action of a 1-form on vector : changing of coordinates - tensor calculus
56446
A kind of converse of Lagrange's Theorem
11358
Eigenvalues of the Lagrangian?
46053
How to find Hamiltonian from this simple Lagrangian? (tricky)
51122
Lagrangian of Schrodinger field
138908
Most general Lagrangian in CFT in 0+1D
67357
Geodesics equations via variational principle
146853
Do we need inertial frames in Lagrangian mechanics?
153727
Constant term in Lagrangian
101786
Proving the Lorentz invariance of the Lorentz invariant phase space element
70880
Invariance of canonical Hamiltonian equation when adding the total time derivative of a function of $q_i$ and $t$ to the Lagrangian
86901
Galilean covariance of the Schrodinger equation