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:
Iowa State Univ, Dep of Mathematics,, Ames, IA, USA, Iowa State Univ, Dep of Mathematics, Ames, IA, USAIowa State Univ, Dep of Mathematics,, Ames, IA, USA, Iowa State Univ, Dep of Mathematics, Ames, IA, USA
Levine, Howard A.
Protter, Murray H.
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Iowa State Univ, Dep of Mathematics,, Ames, IA, USA, Iowa State Univ, Dep of Mathematics, Ames, IA, USAIowa State Univ, Dep of Mathematics,, Ames, IA, USA, Iowa State Univ, Dep of Mathematics, Ames, IA, USA
机构:
Peking Univ, LMAM, Beijing 100871, Peoples R China
Peking Univ, Sch Math Sci, Beijing 100871, Peoples R ChinaPeking Univ, LMAM, Beijing 100871, Peoples R China
Hu, Jun
Yang, Xueqin
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Peking Univ, Sch Math Sci, Beijing 100871, Peoples R ChinaPeking Univ, LMAM, Beijing 100871, Peoples R China