Why we can use partial derivatives to tell if a force is conservative?
62218
Why should Conservative forces have their curl equal to zero?(intuition)
67641
Why should field operators satisfy the classical equations of motion?
13644
Is the change in the Lagrangian always a total derivative for symmetry transformations of the action?
114672
Why do we use the Lagrangian and Hamiltonian instead of other related functions?
109187
The differences between Lagrange and Leibniz's derivative notations
125026
When does order of partial derivatives matter?
93967
Prove partial derivatives exist, but not all directional derivatives exists.
66939
Picturing the how the covariant derivative acts on vector fields
48756
Why are derivatives in interaction terms treated differently from derivatives in the kinetic term?
23975
What is the practical difference between a differential and a derivative?
81912
What causes a force field to be "non-conservative?"
63473
Is the shorthand $ \partial_{\mu} $ strictly a partial derivative in field theory?
40184
Notation in partial differentiation
117613
Interchange of partial derivative and limit
87487
Applications of derivatives outside mathematics and physics
53640
Equality of mixed partial derivatives
11017
Does existence of partial derivatives implies continuity at a point $(x_0,y_0)$?