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Published online by Cambridge University Press: 20 November 2018
In recent years elliptic boundary value problems have been studied in great detail; see, for example, Agmon (1), Agmon, Douglis, and Nirenberg (2), Browder (4), Hormander (7), Schechter (10; 11; 12), Agranovich and Dynin (3). In all these cases the boundary problems considered were local or semilocal, i.e. the boundary operators involved are differential operators possibly having singular integral operators for coefficients (cf. (3)).
A portion of the research contained in this paper was completed by the author while he held a Fellowship at the Summer Research Institute of the Canadian Mathematical Congress organized at Queen's University during the summer of 1966.