Integral Operator Methods for Approximating Solutions of Dirichlet Problems
Robert Pertsch Gilbert · Birkhäuser Basel eBooks · 1970
Let D ⊂ E n be star-like with respect to the origin, bounded, and let Γ aδD have the property that to each x ∈ Γ there corresponds a pair of tangent spheres, of a fixed size, such that one sphere in inside D and the other outside D, In what follows we shall refer to these domains as being appropriate.