The Laplacian on Cartesian products with mixed boundary conditions
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Date
2021-03-03
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Abstract
A definition of the Laplacian on Cartesian products with mixed boundary conditions using quadratic forms is proposed. Its consistency with the standard definition for homogeneous and certain mixed boundary conditions is proved and, as a consequence, tensor representations of the corresponding Sobolev spaces of first order are derived. Moreover, a criterion for the domain to belong to the Sobolev space of second order is proved.
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Tensor product of operators, Mixed boundary condition, Tensor representation of Sobolev spaces