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A Survey on Extremal Problems of Eigenvalues

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  • Ping Yan
  • Meirong Zhang

Abstract

Given an integrable potential q ∈ L1([0, 1], ℝ), the Dirichlet and the Neumann eigenvalues λnD(q) and λnN(q) of the Sturm‐Liouville operator with the potential q are defined in an implicit way. In recent years, the authors and their collaborators have solved some basic extremal problems concerning these eigenvalues when the L1 metric for q is given; ∥q∥L1=r. Note that the L1 spheres and L1 balls are nonsmooth, noncompact domains of the Lebesgue space (L1([01,],ℝ),∥·∥L1). To solve these extremal problems, we will reveal some deep results on the dependence of eigenvalues on potentials. Moreover, the variational method for the approximating extremal problems on the balls of the spaces Lα([0, 1], ℝ), 1

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Handle: RePEc:wly:jnlaaa:v:2012:y:2012:i:1:n:670463
DOI: 10.1155/2012/670463
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