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Étienne Matheron

Publications and source records attributed to Étienne Matheron.

3 recordsLinked to original sources
arXiv2021

Local spectral properties of typical contractions on \(\ell_p,\)-$\,$spaces

We study some local spectral properties of contraction operators on $\ell_p$, $1<p<\infty$ from a Baire category point of view, with respect to the Strong$^*$ Operator Topology. In particular, we show that a typical contraction on $\ell_p$ has Dunford's Property (C) but neither Bishop's Property $(β)$ nor the Decomposition Property $(δ)$, and is completely indecomposable. We also obtain some results regarding the asymptotic behavior of orbits of typical contractions on $\ell_p$.

math.FA↗
arXiv2020

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

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

math.FA↗
arXiv2015

Some universality results for dynamical systems

We prove some "universality" results for topological dynamical systems. In particular, we show that for any continuous self-map $T$ of a perfect Polish space, one can find a dense, $T$-invariant set homeomorphic to the Baire space ${\mathbb N}^{\mathbb N}$; that there exists a bounded linear operator $U: \ell_1 \rightarrow \ell_1$ such that any linear operator $T$ from a separable Banach space into itself with $\Vert T\Vert\leq 1$ is a linear factor of $U$; and that given any $σ$-compact family ${\mathcal F}$ of continuous self-maps of a compact metric space, there is a continuous self-map $U_{\mathcal F}$ of ${\mathbb N}^{\mathbb N}$ such that each $T\in {\mathcal F}$ is a factor of $U_{\mathcal F}$.

math.DS↗