Question: Prove the statement given in this section that the time evolution operator is unitary, under the assumption that the norm of the wave function

Prove the statement given in this section that the time evolution operator S(t, to) = e(i/h) Vint(t)dt'

is unitary, under the assumption that the norm of the wave function ⟨ψt|ψt⟩ = 1 at all times.

S(t, to) = e(i/h) Vint(t)dt'

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