We prove that strictly elliptic operators with generalized Wentzell boundary conditions generate analytic semigroups of angle $\frac{\pi}{2}$ on the space of continuous function on a compact manifold with boundary.
Strictly elliptic operators with Dirichlet boundary conditions on spaces of continuous functions on manifolds
Operators with Wentzell boundary conditions and the Dirichlet-to-Neumann operator
Approximation of continuous functions on Fréchet spaces
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