| 11. | The MP perturbation theory is a special case of RS perturbation theory.
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| 12. | Perturbation theory fails for electron liquids where r _ s > 1.
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| 13. | The higher-order corrections can be obtained by conventional perturbation theory.
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| 14. | The perturbation theory in Feynman diagrams is the same way.
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| 15. | This allowed him to rewrite perturbation theory precisely in the form of diagrams.
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| 16. | This effect could not be seen in any finite order in perturbation theory.
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| 17. | This phenomenon can be explained using cavity perturbation theory.
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| 18. | Slight deviations from the Gaussian fixed point can be described by perturbation theory.
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| 19. | There are currently two distinct approaches to perturbation theory in classical general relativity:
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| 20. | In perturbation theory, forces are generated by the exchange of virtual particles.
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