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- W4299569273 abstract "We obtain a general concept of triplet of Hilbert spaces with closed (unbounded) embeddings instead of continuous (bounded) ones. The construction starts with a positive selfadjoint operator $H$, that is called the Hamiltonian of the system, which is supposed to be one-to-one but may not have a bounded inverse, and for which a model is obtained. From this model we get the abstract concept and show that its basic properties are the same with those of the model. Existence and uniqueness results, as well as left-right symmetry, for these triplets of closely embedded Hilbert spaces are obtained. We motivate this abstract theory by a diversity of problems coming from homogeneous or weighted Sobolev spaces, Hilbert spaces of holomorphic functions, and weighted $L^2$ spaces. An application to weak solutions for a Dirichlet problem associated to a class of degenerate elliptic partial differential equations is presented. In this way, we propose a general method of proving the existence of weak solutions that avoids coercivity conditions and Poincar'e-Sobolev type inequalities." @default.
- W4299569273 created "2022-10-02" @default.
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- W4299569273 date "2013-08-31" @default.
- W4299569273 modified "2023-10-03" @default.
- W4299569273 title "Triplets of Closely Embedded Hilbert Spaces" @default.
- W4299569273 doi "https://doi.org/10.48550/arxiv.1309.0176" @default.
- W4299569273 hasPublicationYear "2013" @default.
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