Fine spectral estimates with applications to the optimally fast solution of large FDE linear systems

@article{Bogoya2021FineSE,
  title={Fine spectral estimates with applications to the optimally fast solution of large FDE linear systems},
  author={Manuel Bogoya and Sergei M. Grudsky and Stefano Serra-Capizzano and Cristina Tablino-Possio},
  journal={BIT Numerical Mathematics},
  year={2021},
  volume={62},
  pages={1417 - 1431}
}
In the present article we consider a type of matrices stemming in the context of the numerical approximation of distributed order fractional differential equations (FDEs). From one side they could look standard, since they are real, symmetric and positive definite. On the other hand they cause specific difficulties which prevent the successful use of classical tools. In particular the associated matrix-sequence, with respect to the matrix-size, is ill-conditioned and it is such that a… 

On the extreme eigenvalues and asymptotic conditioning of a class of Toeplitz matrix-sequences arising from fractional problems

The analysis of the spectral features of a Toeplitz matrix-sequence { Tn(f) } n∈N, generated by a symbol f ∈ L([−π, π]), real-valued almost everywhere (a.e.), has been provided in great detail in the

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