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ftft
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I often hear scientist say that generally the effect of a weak perturbing potential on the ground state of a system is larger than its effect on higher states and that the strength of the weak perturbation on the states decrease as we go higher in energy. For example, if a weak potential is removing degeneracy of states we will always find the strongest splitting happening in the lowest degenerate state. I can't find a reference to this assumption. Is it true anyway? And why so??
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