Where does the Lagrangian come from?
30992
How do you determine the Lagrangian?
150081
Deriving Lagrangian density for electromagnetic field
46053
How to find Hamiltonian from this simple Lagrangian? (tricky)
99312
Why Lagrangian is negative number for a relativistic massive point particle?
31848
Where does gravity get its energy from?
77338
Lagrangian interpolation: degree of the interpolation polynomial
96880
How to obtain Hamiltonian formalism and phase space for Lagrangian with second-derivatives?
13644
Is the change in the Lagrangian always a total derivative for symmetry transformations of the action?
72721
Do an action and its Euler-Lagrange equations have the same symmetries?
44239
Why the extra term $\frac{1}{2}(\partial_{\rho}A^{\rho})^2$ in the photon Lagrangian?
126142
Action principle, Lagrangian mechanics, Hamiltonian mechanics, and conservation laws when assuming Aristotelian mechanics $F=mv$
120098
Work and Kinetic energy rely on each other which came first?
23518
How are the Lagrange points determined?
68813
Geodesic Equation from variation: Is the squared lagrangian equivalent?
28935
Lagrangian of the Euler equations
155492
Exercise on local and global symmetry for a given Lagrangian density
124703
Where does the $i$ come from in the Schrödinger equation?