| 31. | In chemistry, perturbation theory was used to obtain the first solutions for the helium atom.
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| 32. | This means that one can manage this theory only by perturbation theory, with small nonlinearities.
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| 33. | See perturbation theory for more details.
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| 34. | Its validity however extends beyond the scope of perturbation theory as has been demonstrated by Molinari.
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| 35. | She has collaborated on perturbation theory.
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| 36. | Perturbation theory also fails to describe states that are not generated variational method and the WKB approximation.
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| 37. | We will briefly examine the method behind Dirac's formulation of time-dependent perturbation theory.
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| 38. | Perturbation theory can be used in this regime to discuss the properties of weakly interacting electron systems.
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| 39. | In ordinary QM these terms have to be put in by hand and treated using perturbation theory.
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| 40. | In the low energy limit of QCD, a description by means of perturbation theory is not possible.
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