The cone algebra
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A manifold with smooth boundary can be regarded as a manifold with edge, and boundary value problems can be interpreted as specific edge problems. In the edge case the inner normal turns into the axial variable of a cone transverse to the edge, and the boundary symbol calculus is now replaced by a calculus on the respective cone. In order to treat edge problems with global projection conditions, we first outline the calculus of operators on a manifold with conical singularities.
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