Note on matrices with a very ill-conditioned eigenproblem

@article{Wilkinson1972NoteOM,
  title={Note on matrices with a very ill-conditioned eigenproblem},
  author={J. H. Wilkinson},
  journal={Numerische Mathematik},
  year={1972},
  volume={19},
  pages={176-178}
}
SummaryGives a bound for the distance of a matrix having an ill-conditioned eigenvalue problem from a matrix having a multiple eigenvalue which is generally sharper than that which has been published hitherto. 
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References

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Handbook for Automatic Computation
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