《费恩曼图(英文版)》内容简介：Inrecentyearsparticletheoryhasbeenverysuccessful.Thetheoryagreeswiththedatawhereveritcouldbetested,andwhilethetheoryhasitsweakspots,thisnumericalagreementisasolidfact.Physicsisaquantitativescience,andsuchagreementdefinesitsvalidity.Itisafactthatthetheory,orratherthesuccessfulpart,isperturbationtheory.Uptothisdaythemethodsfordealingwithnon-perturbativesituationsarelessthanperfect.Noone,forexample,canclaimtounderstandfullythestructureoftheprotonorthepionintermsofquarks.Themassesandotherpropertiesoftheseparticleshavenotreallybeenunderstoodinanydetail.Itmustbeaddedthatthereexists,strictlyspeaking,nosoundstartingpointfordealingwithnon-perturbativesituations.