摘要
The prensent paper is a resume in the qualitative researches of the ultrahyperbolic equation,it involves a new proof of Asgeirsson's mean value theorem,extensions of mean value theorem,non-analyticity of the generalized potential solution,extensionality of solution,boundary problems and the elementary solution. Especially,we suggest to study ultrahyperbolie equation by means of the elementary solution,which is a natural way.
基金
中国科学院科学基金资助的课题
