Geodesic
On the emptiness criteria for the discrete spectrum of the Dirichlet problem for the equation
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 49 (2009) no. 2, pp. 288-292

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An improved Rellich emptiness criterion is proposed for the discrete spectrum of the Dirichlet problem for the equation $\Delta v+\lambda v=0$. Examples of its application are given. 
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     author = {M. D. Malykh},
     title = {On the emptiness criteria for the discrete spectrum of the {Dirichlet} problem for the equation},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
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     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {2009},
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     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_2_a6/}
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M. D. Malykh. On the emptiness criteria for the discrete spectrum of the Dirichlet problem for the equation. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 49 (2009) no. 2, pp. 288-292. http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_2_a6/