Recent content by Berny

many thanks for help. I find a commutator value depending upon the system energy : commutator = E(m) U(m,n) if E= E(m) and - E(n) U(m,n) if E=E(n). in other cases it's zero. Is this correct ?

Homework Statement |phi (n)> being eigen states of hermitian operator H ( H could be for example the hamiltonian of anyone physical system ). The states |phi (n)> form an orthonormal discrete basis. The operator U(m,n) is defined by: U(m,n)= |phi(m)><phi(n)| Calculate the commutator...