English

Does a typical $\ell_p\,$-$\,$space contraction have a non-trivial invariant subspace?

Functional Analysis 2020-12-04 v1

Abstract

Given a Polish topology τ\tau on B1(X){{\mathcal{B}}_{1}(X)}, the set of all contraction operators on X=pX=\ell_p, 1p<1\le p<\infty or X=c0X=c_0, we prove several results related to the following question: does a typical TB1(X)T\in {{\mathcal{B}}_{1}(X)} in the Baire Category sense has a non-trivial invariant subspace? In other words, is there a dense GδG_\delta set G(B1(X),τ)\mathcal G\subseteq ({{\mathcal{B}}_{1}(X)},\tau) such that every TGT\in\mathcal G has a non-trivial invariant subspace? We mostly focus on the Strong Operator Topology and the Strong^* Operator Topology.

Keywords

Cite

@article{arxiv.2012.02016,
  title  = {Does a typical $\ell_p\,$-$\,$space contraction have a non-trivial invariant subspace?},
  author = {Sophie Grivaux and Étienne Matheron and Quentin Menet},
  journal= {arXiv preprint arXiv:2012.02016},
  year   = {2020}
}

Comments

50 pages

R2 v1 2026-06-23T20:42:31.870Z