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PreprintCC BY 4.0arXiv

The topology of tridiagonal isospectral sets

  • David Martínez Torres
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Abstract

We describe the topology of the set of tridiagonal symmetric real matrices with fixed non-simple spectrum. The tridiagonal isospectral set is not a submanifold of the corresponding orthogonal conjugacy class, but a collection of submanifolds which intersect cleanly. We show that the tridiagonal isospectral set is an aspherical space and that its Betti numbers are combinatorial numbers. This generalizes to arbitrary spectrum constructions and results known for simple spectrum. We also extend these results to split real semisimple Lie algebras.

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Cite

BibTeXRIS
BibTeX
@misc{torres2026topology,
  title = {{The topology of tridiagonal isospectral sets}},
  author = {David Martínez Torres},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.05733},
  eprint = {2609.05733},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.05733},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - The topology of tridiagonal isospectral sets
AU  - David Martínez Torres
PY  - 2026
DA  - 2026/09/04
PB  - arXiv
DO  - 10.48550/arxiv.2609.05733
UR  - https://arxiv.org/abs/2609.05733
AB  - We describe the topology of the set of tridiagonal symmetric real matrices with fixed non-simple spectrum. The tridiagonal isospectral set is not a submanifold of the corresponding orthogonal conjugacy class, but a collection of submanifolds which intersect cleanly. We show that the tridiagonal isospectral set is an aspherical space and that its Betti numbers are combinatorial numbers. This generalizes to arbitrary spectrum constructions and results known for simple spectrum. We also extend these results to split real semisimple Lie algebras.
ER  -