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    Excercise on distinguishable particles interacting with Hamiltonian

    Please, help me with this problem! Two distinguishable particles of spin 1/2 interact with Hamiltonian H=A*S1,z*S2,x with A a positive constant. S1,z and S2,x are the operators related to the z-component of the spin of the first particle and to the x-component of the spin of the second...