Geodesic
On the eigenvalues of the first boundary value problem in unbounded domains
Sbornik. Mathematics, Tome 18 (1972) no. 2, pp. 235-248 Cet article a éte moissonné depuis la source Math-Net.Ru

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This paper is devoted to the investigation of the spectrum of a polyharmonic operator in unbounded domains. The class of domains for which the spectrum of the corresponding first boundary value problem is discrete is examined. The classical asymptotic formula for eigenvalues is extended to the case of domains of finite volume. A two-sided bound for the distribution function of the eigenvalues is obtained in the general case. If the domain behaves sufficiently regularly at infinity, then the upper and lower bounds coincide in order. The results are new also for the Laplace operator. Bibliography: 13 titles. 
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G. V. Rozenblum. On the eigenvalues of the first boundary value problem in unbounded domains. Sbornik. Mathematics, Tome 18 (1972) no. 2, pp. 235-248. http://geodesic.mathdoc.fr/item/SM_1972_18_2_a5/

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