Recent Developments In Partial Differential

The series “quaderni di matematica” is planned as a sequence of thematic volumes, each presenting one or more papers that deal with relevant problems in the same branch of mathematical research. The collected papers in each issue, further than new and meaningful results in their field, should also offer an uptodated picture of at least the recent researches about the problems they treat, together — if possible — with a quick look to their origin and relevance. Accordingly, will be published in the volumes of the Series only those papers whose Authors will have been explicitly invited by an Editor appointed by the Editorial Board, composed of the professors of the Department of Mathematics of the Second University of Naples.Contributi di Bruno Carbonaro, Giovanni Paolo Galdi, Christian G. Simader, Vsevolod A. Solonnikov, Giulio Starita, Tullio Valent, Thomas Ziegler.