Is there a deep reason why a non-relativistic Lagrangian does not have higher order derivatives?
4989
Why are there only derivatives to the first order in the Lagrangian?
16786
Is there any case in physics where the equations of motion depend on high time derivatives of the position?
68813
Geodesic Equation from variation: Is the squared lagrangian equivalent?
138424
Scalar field Derivative. Real vs Complex
66919
When/why does the principle of least action plus boundary conditions not uniquely specify a path?
90325
Why use the derivative and not the symmetric derivative?
111611
When can we add a total time derivative of $f(q, \dot{q}, t)$ to a Lagrangian?
3603
Lagrangian and Hamiltonian EOM with dissipative force
125774
Derivative of $a^x$ from first principles
157347
continuity, discontinuity derivative and relation to being derivative but its partials are not continuous
76894
Why is spacetime not Riemannian?
17414
Lagrangian of an effective potential
11358
Eigenvalues of the Lagrangian?
125026
When does order of partial derivatives matter?
87800
Covariant derivative ambiguity
64727
Total time derivatives and partial coordinate derivatives in classical mechanics
109187
The differences between Lagrange and Leibniz's derivative notations