Supercloseness Between the Elliptic Projection and the Approximate Eigenfunction and Its Application to a Postprocessing of Finite Element Eigenvalue Problems

  • Andrey B. Andreev
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3401)


An estimate confirming the supercloseness between the Ritz projection and the corresponding eigenvectors, obtained by finite element method, is hereby proved. This result is true for a large class of self-adjoint 2m–order elliptic operators. An application of this theorem to the superconvergence postprocessing patch-recovery technique for finite element eigenvalue problems is also presented. Finally, the theoretical investigations are supported by numerical experiments.


finite elements eigenvalue problem superconvergence postprocessing 

2000 Subject Classification

65N30 65N25 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Andrey B. Andreev
    • 1
  1. 1.Technical University of Gabrovo & IPP – Bulgarian Academy of Sciencies 

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