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Approximate eigenfunctions of the Laplacian. (English) Zbl 0385.58012


MSC:

58J50 Spectral problems; spectral geometry; scattering theory on manifolds
35P15 Estimates of eigenvalues in context of PDEs
58J60 Relations of PDEs with special manifold structures (Riemannian, Finsler, etc.)
53C22 Geodesics in global differential geometry
53C20 Global Riemannian geometry, including pinching
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