Old and New Aspects in Spectral Geometry by M.-E. Craioveanu, Mircea Puta, Themistocles RASSIAS.
It is known that to any Riemannian manifold (M, g ) , with or without boundary, one can associate certain fundamental objects. Among them are the Laplace-Beltrami opera tor and the Hodge-de Rham operators, which are natural [that is, they commute with the isometries of (M,g)], elliptic, self-adjoin...
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