Why there is added a partial time derivative in formula for time derivative of potential energy?
103000
What is the difference between implicit, explicit, and total time dependence, e.g. $\frac{\partial \rho}{\partial t}$ and $\frac{d \rho} {dt}$?
152750
Is there a time operator in quantum mechanics?
142821
Why?$\int_0^1\int_{u(t)}^{u(t)+w(t)} f(t,v(t)) dv dt = \int_0^1 f(t,u(t)+\theta w(t))w(t) dt; ~~\theta\in[0,1] $
59004
Why does time evolution operator have the form $U(t) = e^{-itH}$?
133424
Why do we make a distinction between derivatives and partial derivatives?
80627
Evolution operator for time-dependent Hamiltonian
131167
Kinetic energy of the object, but Potential energy of the system: Why is it so?
66919
When/why does the principle of least action plus boundary conditions not uniquely specify a path?
123911
Why is the derivative of a vector orthogonal to the vector itself?
84984
What does $\partial_{\mu}$ mean?
4989
Why are there only derivatives to the first order in the Lagrangian?
49060
What is the difference in the uses of $\omega t$ and $kx$ in wave equation?
100944
The relationship between the energy and amplitude of a wave? Derivation?
40184
Notation in partial differentiation
65039
What is the reason of $dT/dh = 0$ in the gas column?
65100
Derivative of the product of operators and Derivative of exponential
34004
Why is time evolution unitary?