webpage updated 2/29/2012
Orig. Ed 1962, Reprint Ed. 1975
It has been the purpose and hope of the author in writing this book to help fill a serious need for introductory texts on the graduate level in the field of partial differential equations. The vastness of the field and even more significantly, the absence of a comprehensive basic theory have been responsible, we believe, for the comparative scarcity of introductory books dealing with this subject.