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I saw someplace that if H is written in the total AM base as a function of S^2 and Sz then it's diagonal in that basis and the value of s^2 and Sz are constant in time.

S^2 and Sz are Its eigenvectors? no, becasue they are matrices.

why H is diagonal if it is written as function of S^2 and Sz?

And if H is diagonal why this implies that S^2 and Sz are constant in time?

Every time the H is diagonal it's eigenvalues are constant in time?

How can I tell based on the hamiltonian that values are constant in time?

thanks

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# Hemiltonian Question

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