Projects per year

### Abstract

In the first part of this manuscript a relationship between the spectrum of self-adjoint operator matrices and the spectra of their diagonal entries is found. This leads to enclosures for spectral points and in particular, enclosures for eigenvalues. We also consider graph invariant subspaces, and their corresponding angular operators. The existence of a bounded angular operator leads to basis properties of the first component of eigenvectors of operator matrices for which the corresponding eigenvalues lie in a half line. The results are applied to an example from magnetohydrodynamics.

Original language | English |
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Pages (from-to) | 257-277 |

Number of pages | 21 |

Journal | Integral Equations and Operator Theory |

Volume | 67 |

Issue number | 2 |

DOIs | |

Publication status | Published - 2010 |

### Keywords

- schur complement
- magnetohydrodynamics
- bari basis
- angular operator
- graph invariant subspace
- eigenvalue estimates

## Projects

- 1 Finished

## Spectral Theory of Block Operator Matrices

EPSRC (Engineering and Physical Sciences Research Council)

1/09/07 → 30/11/09

Project: Research

## Cite this

Strauss, M. (2010). Spectral estimates and basis properties for self-adjoint block operator matrices.

*Integral Equations and Operator Theory*,*67*(2), 257-277. https://doi.org/10.1007/s00020-010-1780-0