拟微分算子技巧（英文版）

ItisgenerallywellknownthattheFourier-LaplacetransformconvertsalinearconstantcoefficientPDEP(D)u=fonRntoanequationP(§)u-(§)=f-(§),forthetransformsu-,f-ofuandf,sothatsolvingP(D)u=fjustamountstodivisionbythepolynomialP(§).Thepracticalapplicationwassuspect,andillunderstood,however,untiltheoryofdistributionsprovidedabasisforalogicallyconsistenttheory.ThereafteritbecametheFourier-Laplacemethodforsolvinginitial-boundaryproblemsforstandardPDE.Werecallthesefactsinsomedetailinsec＇s1-4ofch.0.