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Homework Statement
Consider the transformation from the variables (q,p) to (Q,P) by virtue of q = q(Q,P), p = p(Q,P) and H(q,p,t) = H(Q,P,t). Show that the equations of motion for Q,P are:
[itex]\partial[/itex]H/[itex]\partial[/itex]Q = -JDdP/dt
[itex]\partial[/itex]H/[itex]\partial[/itex]P = JDdQ/dt
where JD is the Jacobian determinant det([itex]\partial[/itex](q,p)/[itex]\partial[/itex](Q,P))
this shows the transformation is canonical only if JD=1.
Homework Equations
The Attempt at a Solution
I have tried to write some equations which might help me. They can be found on the attached picture. I would like to know which these can get me on track of the solution. Also I would like to know if my expression for the Jaciobian determinant is correct.
As a side question I would like to know why you can assume the two variables to have same hamiltonian. Is this because the transformation is not time dependent?