## Abstract

This paper concerns the spectral analysis of matrix-sequences that are generated by the discretization and numerical approximation of partial differential equations, in case the domain is a generic Peano–Jordan measurable set. It is observed that such matrix-sequences often present a spectral symbol, that is a measurable function describing the asymptotic behaviour of the eigenvalues. When the domain is a hypercube, the analysis can be conducted using the theory of generalized locally Toeplitz (GLT) sequences, but in case of generic domains, a different kind of matrix-sequences and theory has to be formalized. We thus develop in full detail the theory of reduced GLT sequences and symbols, presenting some application to finite differences and finite elements discretization for linear convection–diffusion–reaction differential equations.

Original language | English |
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Pages (from-to) | 681 - 743 |

Number of pages | 63 |

Journal | BIT Numerical Mathematics |

Volume | 62 |

Issue number | 3 |

Early online date | 14 Sept 2021 |

DOIs | |

Publication status | Published - Sept 2022 |

MoE publication type | A1 Journal article-refereed |

## Keywords

- Algebra of sequences
- Asymptotic distribution of singular values and eigenvalues
- Discretization of PDE on general domain
- Finite differences
- Finite elements
- Multilevel generalized locally Toeplitz sequence