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multiply connected bounded domain, Boundary value problems for second-order elliptic equations, Completeness of eigenfunctions and eigenfunction expansions in context of PDEs, eigenfunction expansion, essentially self-adjoint operator, elliptic eigenvalue problem
multiply connected bounded domain, Boundary value problems for second-order elliptic equations, Completeness of eigenfunctions and eigenfunction expansions in context of PDEs, eigenfunction expansion, essentially self-adjoint operator, elliptic eigenvalue problem
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