Lagrangians with higher derivatives than Klein-Gordon
4989
Why are there only derivatives to the first order in the Lagrangian?
157191
Conjugate Variables, Noether's Theorem and QM
63473
Is the shorthand $ \partial_{\mu} $ strictly a partial derivative in field theory?
17414
Lagrangian of an effective potential
4421
Proof that total derivative is the only function that can be added to Lagrangian without changing the EOM
36380
Why not use the Lagrangian, instead of the Hamiltonian, in nonrelativistic QM?
121914
Unitary representations of the diffeomorphism group in curved spacetime
18825
Integrable but not differentiable function
114672
Why do we use the Lagrangian and Hamiltonian instead of other related functions?
3603
Lagrangian and Hamiltonian EOM with dissipative force
115012
Klein-Gordon inner product
64727
Total time derivatives and partial coordinate derivatives in classical mechanics
105398
Physical intuition for higher order derivatives
82135
Lagrangian to Hamiltonian in Quantum Field Theory
120474
Does the lagrangian contain all the information about the representations of the fields in QFT?
56429
Extension of partial derivatives and the definition of $C^k(\overline{\Omega})$
96880
How to obtain Hamiltonian formalism and phase space for Lagrangian with second-derivatives?