俄罗斯数学Demidov2001en.pdf

俄罗斯数学Demidov2001en.pdf简介：
Generalizedfunctionsinmathematicalphysics.MainideasandconceptsA.S.DemidovContentsPrefaceviiNotationxiChapter1.Introductiontoproblemsofmathematicalphysics11.Temperatureatapoint?No!Involumescontractingtothepoint12.Thenotionofδ-sequenceandδ-function43.Somespacesofsmoothfunctions.Partitionofunity64.Examplesofδ-sequences105.OntheLaplaceequation116.Ontheheatequation197.TheOstrogradsky–Gaussformula.TheGreenformulaeandtheGreenfunction288.TheLebesgueintegral1)319.ThespacesLpandLploc4010.FunctionsofL1locaslinearfunctionalonC∞04511.Simplesthyperbolicequations.GeneralizedSobolevsolutions46Chapter2.ThespacesD[,D#andD0.Elementsofthedistributiontheory(generalizedfunctioninthesenseofL.Schwartz)5912.ThespaceD[oftheSobolevderivatives5913.ThespaceD#ofgeneralizedfunctions6314.Theproblemofregularization6615.Generalizedfunctionswithapointsupport.TheBoreltheorem6816.ThespaceD0ofgeneralizedfunctions(distributionsbyL.Schwartz)72vviCONTENTSChapter3.ThespacesHs.Pseudodifferentialoperators8117.TheFourierseriesandtheFouriertransform.ThespacesSandS08118.TheFourier–Laplacetransform.ThePaley–Wienertheorem9419.Fundamentalsolutions.Convolution9920.OnspacesHs10221.Onpseudodifferentialoperators(PDO)10622.Onellipticproblems111Addendum.AddendumAnewapproachtothetheoryofgeneralizedfunctions(Yu.V.Egorov)129Bibliography137Index141PrefacePresently,thenotionoffunctionisnotasfinallycrystallizedanddefinitelyestablishedasitseemedattheendofthe19thcen-tury;onecansaythatatpresentthisnotionisstillinevolution,andthatthedisputeconcerningthevibratingstringisstillgoingononly,ofcourse,indifferentscientificcircumstances,involvingotherpersonalitiesandusingotherterms.LuzinN.N.(1935)[42]Itissymbolicthatinthatsameyearof1935,S.L.Sobolev,whowas26yearsoldthattime,submittedtotheeditorialboardofthejournalMatematicheskiysbornikhisfamouswork[61]andpub-lishedatthesametimeitsbriefversioninDokladyANSSSR[60].Thisworklaidfoundationsofacompletelynewoutlookonthecon-ceptoffunction,unexpectedevenforN.N.Luzin—theconceptofageneralizedfunction(in 展开>>

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