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The central term in the hamiltonian formalism. Can be interpreted as an energy input, or "true" energy.

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In a two level system, $|e\rangle$ meant excited states, and $|g\rangle$ meant ground states. I guess you are using undergraduate quantum, in that case, most of the time one only need to know that $ …
answered May 22 by user9976437
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First, numerically one could never actually done infinite summation. Second, the "magic" of Dyson series was convergences, that if you done more and more closely step, discrete integration, the solu …
answered Jul 16 by user9976437