Higher order Lagrangians
75612
Why are differential equations for fields in physics of order two?
105572
Independent Variables of a Lagrangian
17414
Lagrangian of an effective potential
125738
Names of higher-order derivatives
85094
A problem from Evans' PDEs book: find a Lagrangian for a given Euler-Lagrange equation
48930
Least-action classical electrodynamics without potentials
68906
Do the same equations of motion imply the same Lagrangians?
120529
Relations between diffeomorphism symmetry theories and invariant $SU(N), N \rightarrow \infty$ theories
114172
Derivation of Hamilton-Jacobi theory using canonical transformations
112073
What does a Lagrangian of the form $L=m^2\dot x^4 +U(x)\dot x^2 -W(x)$ represent?
126390
Covariance of Euler-Lagrange equations under change of generalized coordinates
155913
Lagrangian for free particle in special relativity
105293
Proof of the second symmetric derivative
131016
Question about Klein-Gordon field Lagrangian
101002
Is there either a Lagrangian or a Hamiltonian formulation of electromagnetism with continuous distributions of magnetic monopoles?
138908
Most general Lagrangian in CFT in 0+1D
87259
Constraints of relativistic point particle in Hamiltonian mechanics