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Titlebook: Degenerate Elliptic Equations; Serge Levendorskii Book 1993 Springer Science+Business Media B.V. 1993 Boundary value problem.Sobolev space

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Some Classes of Hypoelliptic Pseudodifferential Operators on Closed Manifold,The results of this section are well — known. See, for instance Hörmander [7].
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Spectral Asymptotics of Degenerate Elliptic Operators,Let . be one of the forms introduced in Chapter 6 and let .and .. be the same as in Subsection 3.1.2. Let either . satisfy the conditions of one of Theorems 6.2.1.1, 6.3.1.1, 6.4.1.1 and . or let . satisfy the conditions of Theorem 6.3.1.2 and . denote by . the operator associated with the variational triple .,., ..(Ω; ℂ.).
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General Calculus of Pseudodifferential Operators,iGaaiaabeqaamaabaabaaGcbaGaamysamaaBa% aaleaacaWGibWaaSbaaWqaaiaadMgaaeqaaaWcbeaaaaa!38E1!]]
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https://doi.org/10.1007/978-3-540-71283-1 assume that on ... admits the representation . where a. Є .∞(Г × (0,.); . (ℂ.), ., and the points (.,.,..) lie on the lower surface .’ of a convex polyhedron . with vertices at certain points of the form (.,.,..) with either l or j being equal to zero. Let us assume that .. ≥ .. if (.) ≥ (.), that is . ≥ .’, . ≥ .’.
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Model Classes of Degenerate Elliptic Differential Operators, assume that on ... admits the representation . where a. Є .∞(Г × (0,.); . (ℂ.), ., and the points (.,.,..) lie on the lower surface .’ of a convex polyhedron . with vertices at certain points of the form (.,.,..) with either l or j being equal to zero. Let us assume that .. ≥ .. if (.) ≥ (.), that is . ≥ .’, . ≥ .’.
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