Two-term lower bounds of Berzin-Li-Yau type are obtained for the sums of eigenvalues of elliptic operators and systems with constant coefficients and Dirichlet boundary conditions. The polyharmonic operator, the Stokes system and its generalizations, the two-dimensional buckling problem, and also the Klein-Gordon operator are considered. Bibliography: 32 titles.
机构:
Wuhan Univ, Sch Math & Stat, Wuhan 430072, Peoples R China
Wuhan Univ, Computat Sci Hubei Key Lab, Wuhan 430072, Peoples R ChinaWuhan Univ, Sch Math & Stat, Wuhan 430072, Peoples R China
Chen, Hua
Zhou, Yifu
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Wuhan Univ, Sch Math & Stat, Wuhan 430072, Peoples R China
Wuhan Univ, Computat Sci Hubei Key Lab, Wuhan 430072, Peoples R ChinaWuhan Univ, Sch Math & Stat, Wuhan 430072, Peoples R China
机构:
Cent S Univ, Sch Math Sci & Comp Technol, Changsha 410083, Hunan, Peoples R ChinaCent S Univ, Sch Math Sci & Comp Technol, Changsha 410083, Hunan, Peoples R China
Tang, X. H.
He, Xiaofei
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Cent S Univ, Sch Math Sci & Comp Technol, Changsha 410083, Hunan, Peoples R China
Jishou Univ, Coll Math & Comp Sci, Jishou 416000, Hunan, Peoples R ChinaCent S Univ, Sch Math Sci & Comp Technol, Changsha 410083, Hunan, Peoples R China