IntroductiontoregularperturbationtheoryVeryoften,amathematicalproblemcannotbesolvedexactlyor,iftheexactsolutionisavailable,itexhibitssuchanintricatedependencyintheparametersthatitishardtouseassuch.Itmaybethecase,however,thataparametercanbeidentified,say",suchthatthesolution
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