Proving Constant Time of "If and, then"

[tinipink]

Homework Statement

. Show that if

and

, then

is constant in time.

Homework Equations

The Attempt at a Solution

 

[JeremyG]

No attempt?

 

[tinipink]

d<A>/dt=i/h x ([H,A]) + dA/dt
Therefore if

and dA/dt=0 , then dA/dt=0. Is this it.? :-(

 

[Drakkith]

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