Egorov, Yu. V.; Kondrat’ev, V. A. On the negative spectrum of an elliptic operator. (English. Russian original) Zbl 0784.35069 Mosc. Univ. Mech. Bull. 47, No. 2, 51-53 (1992); translation from Vestn. Mosk. Univ., Ser. I 1992, No. 2, 88-91 (1992). See the review in Zbl 0777.35043. MSC: 35P15 Estimates of eigenvalues in context of PDEs 47F05 General theory of partial differential operators Keywords:symmetric elliptic; two-sided bound on the first eigenvalue Citations:Zbl 0777.35043 PDFBibTeX XMLCite \textit{Yu. V. Egorov} and \textit{V. A. Kondrat'ev}, Mosc. Univ. Mech. Bull. 47, No. 2, 51--53 (1992; Zbl 0784.35069); translation from Vestn. Mosk. Univ., Ser. I 1992, No. 2, 88--91 (1992)