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PreprintCC BY 4.0arXiv

Universal operators: topology and consequences of ISP failure

  • João Carmo
  • Ben-Hur Eidt
  • Waleed Noor
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Abstract

Assuming a negative answer to the invariant subspace problem for separable complex Hilbert spaces, we prove that every universal operator has a continuum of minimal infinite-dimensional invariant subspaces with pairwise trivial intersections. These subspaces can be chosen so that the restrictions are invertible and their powers decay at any prescribed geometric rate. For an affine composition operator on the Hardy space H2(𝔻), we derive restrictions on the zeros, inner factors and Hardy regularity of generators, and construct minimal models with radial vanishing of any prescribed finite order. Independently of the invariant subspace problem, we identify the norm interior, closure and boundary of the universal operator class. Its interior is the Caradus--Pozzi class, its closure is the complement of the upper semi-Fredholm class, and its boundary consists of the operators that are neither upper nor lower semi-Fredholm.

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Cite

BibTeXRIS
BibTeX
@misc{carmo2026universal,
  title = {{Universal operators: topology and consequences of ISP failure}},
  author = {João Carmo and Ben-Hur Eidt and Waleed Noor},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.22694},
  eprint = {2610.22694},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.22694},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Universal operators: topology and consequences of ISP failure
AU  - João Carmo
AU  - Ben-Hur Eidt
AU  - Waleed Noor
PY  - 2026
DA  - 2026/10/19
PB  - arXiv
DO  - 10.48550/arxiv.2610.22694
UR  - https://arxiv.org/abs/2610.22694
AB  - Assuming a negative answer to the invariant subspace problem for separable complex Hilbert spaces, we prove that every universal operator has a continuum of minimal infinite-dimensional invariant subspaces with pairwise trivial intersections. These subspaces can be chosen so that the restrictions are invertible and their powers decay at any prescribed geometric rate. For an affine composition operator on the Hardy space H^2(𝔻), we derive restrictions on the zeros, inner factors and Hardy regularity of generators, and construct minimal models with radial vanishing of any prescribed finite order. Independently of the invariant subspace problem, we identify the norm interior, closure and boundary of the universal operator class. Its interior is the Caradus--Pozzi class, its closure is the complement of the upper semi-Fredholm class, and its boundary consists of the operators that are neither upper nor lower semi-Fredholm.
ER  -