Exponential growth and the spectrum of the Laplacian

Exponential growth and the spectrum of the Laplacian
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Proc. Amer. Math. Soc. 82 (1981), 473-477

DOI: https://doi.org/10.1090/S0002-9939-1981-0612743-3

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Conditions are given on a noncompact manifold which allow one to conclude that 0 is in the spectrum of the Laplacian on $M$.

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