Geodesic
On $(p,l)$-capacity, inbedding theorems, and the spectrum of a selfadjoint elliptic operator
Izvestiya. Mathematics, Tome 7 (1973) no. 2, pp. 357-387 
V. G. Maz'ya. On $(p,l)$-capacity, inbedding theorems, and the spectrum of a selfadjoint elliptic operator. Izvestiya. Mathematics, Tome 7 (1973) no. 2, pp. 357-387. http://geodesic.mathdoc.fr/item/IM2_1973_7_2_a7/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Necessary and sufficient conditions are found for continuity, compactness, and closability of imbedding operators of some function spaces into the space $L_p$. These results (for $p=2$) give criteria for positive definiteness and discreteness of the spectrum of the Dirichlet problem for a selfadjoint elliptic operator of arbitrary order. Some integral inequalities are considered for differentiable functions on a cube.

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