Gauge invariance of the Hamiltonian
70880
Invariance of canonical Hamiltonian equation when adding the total time derivative of a function of $q_i$ and $t$ to the Lagrangian
57051
Why does Quantum Field Theory use Lagrangians rather than Hamiltonians?
58445
What does the Canonical Commutation Relation (CCR) tell me about the overlap between Position and Momentum bases?
34445
Why is the determinant of a symplectic matrix 1?
44747
Finding the effective Hamiltonian in a certain subspace
89479
Galilean invariance of a subset of Maxwell equations
78182
Hamiltonian or not?
143157
Perturbation theory: justifying expansion in terms of eigenstates of the basis Hamiltonian
45061
Physical interpretation of $Q^i = \partial _\nu T^{i \nu}$
13644
Is the change in the Lagrangian always a total derivative for symmetry transformations of the action?
125565
Counting the number of propagating degrees of freedom in Lorenz Gauge Electrodynamics
158526
Finding a "Principle of Least Action" equivalent statement for Hamiltonian Mechanics
86901
Galilean covariance of the Schrodinger equation
99285
Why is the change in Hamiltonian for an active infinitesimal canonical transformation defined the way it is?
28935
Lagrangian of the Euler equations
94173
Deriving the Lagrangian for a free particle
51122
Lagrangian of Schrodinger field