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机译:Closure of the Laplace-Beltrami Operator on 2D Almost-Riemannian Manifolds and Semi-Fredholm Properties of Differential Operators on Lie Manifolds
Univ Aveiro;
Almost-Riemannian geometry; Laplace-Beltrami operator; Lie groupoids; Semi-Fredholm conditions; C-ASTERISK-ALGEBRAS; ESSENTIAL SPECTRUM; PSEUDODIFFERENTIAL-OPERATORS; GROUPOIDS;