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If the evolution operator is given as follows

[tex]U(t) = \exp[-i (f(p, t) + g(x))/\hbar][/tex]

where p is momentum, t is time. Can I conclude that the Hamiltonian is

[tex]H(t) = f(p, t) + g(x)[/tex]

if no, why?

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# From unitary operator to hamiltonian

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