Mathematics – Analysis of PDEs
Scientific paper
2011-04-05
J. Math. Anal. Appl. 382 (2011) 339-363
Mathematics
Analysis of PDEs
29 pages, proofreading corrections, to appear in J. Math. Anal. Appl
Scientific paper
For a second-order symmetric strongly elliptic operator A on a smooth bounded open set \Omega in R^n with boundary \Sigma, the mixed problem is defined by a Neumann-type condition on a part Sigma_+ of the boundary and a Dirichlet condition on the other part Sigma_-. We show a Krein resolvent formula, where the difference between its resolvent and the Dirichlet resolvent is expressed in terms of operators acting on Sobolev spaces over Sigma_+. This is used to obtain a new Weyl-type spectral asymptotics formula for the resolvent difference (where upper estimates were known before), namely s_j j^{2/(n-1)}\to C_{0,+}^{2/(n-1)}, where C_{0,+} is proportional to the area of Sigma_+, in the case where A is principally equal to the Laplacian.
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