AbstractBoundary layer potentials with Hölder‐continuous densities are widely used for representing solutions of boundary value problems for certain partial differential equations. These potentials are of the typewith |ρ| odd and a density λ of classCk+α. This paper presents a self‐contained exposition of the fact that the potentialvmay be continued asCk+α‐functions ontoGandℝnGrespectively (together with estimates for the Hölder‐norms) under the least possible regularity assumption for the boundary ∂G: it has to
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