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Schrodinger operators, operators on manifolds, general differential operators, numerical studies, integral operators, discrete models, resonances, non-self-adjoint operators, random operators/matrices

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Show that the Laplacian operator on the Heisenberg group is negative

The factorization of the Heisenberg Laplacian is well known, see http://www.scirp.org/journal/PaperDownload.aspx?paperID=22807
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