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## Main Question or Discussion Point

since the time derivative is second order, the KG equation can not be put in the form

i \dot{\psi}= H \psi

so there is no H in KG equation?

and no heisenberg picture for KG equation?

i \dot{\psi}= H \psi

so there is no H in KG equation?

and no heisenberg picture for KG equation?