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We give a sufficient condition for two operators to be disjointly frequently hypercyclic. We apply this criterion to composition operators acting on $H(\mathbb D)$ or on the Hardy space $H^2(\mathbb D)$. We simplify a result on disjoint…

Functional Analysis · Mathematics 2022-11-24 Frédéric Bayart

We introduce and study the notion of hereditary frequent hypercyclicity, which is a reinforcement of the well known concept of frequent hypercyclicity. This notion is useful for the study of the dynamical properties of direct sums of…

Functional Analysis · Mathematics 2024-09-12 F. Bayart , S. Grivaux , E. Matheron , Q. Menet

In this short note, we answer a question of Martin and Sanders [Integr. Equ. Oper. Theory, 85 (2) (2016), 191-220] by showing the existence of disjoint frequently hypercyclic operators which fail to be disjoint weakly mixing and, therefore,…

Functional Analysis · Mathematics 2021-06-03 Özgür Martin , Yunied Puig

We obtain a Disjoint Frequent Hypercyclicity Criterion and show that it characterizes disjoint frequent hypercyclicity for a family of unilateral pseudo-shifts on $c_0(\mathbb{N})$ and $\ell^p(\mathbb{N})$, $1\le p <\infty$. As an…

Functional Analysis · Mathematics 2021-06-04 Özgür Martin , Quentin Menet , Yunied Puig

An operator $T$ acting on a separable complex Hilbert space $H$ is said to be hypercyclic if there exists $f\in H$ such that the orbit $\{T^n f:\ n\in \mathbb{N}\}$ is dense in $H$. Godefroy and Shapiro \cite{GoSha} characterized those…

Functional Analysis · Mathematics 2023-07-06 Mohamed Amouch , Fernando León-Saavedra , M. P. Romero de la Rosa

We provide a sufficient condition for an operator $T$ on a non-metrizable and sequentially separable topological vector space $X$ to be sequentially hypercyclic. This condition is applied to some particular examples, namely, a composition…

Functional Analysis · Mathematics 2024-03-08 Alfred Peris

The question of whether a hypercyclic operator $T$ acting on a Fr{\'e}chet algebra $X$ admits or not an algebra of hypercyclic vectors (but 0) has been addressed in the recent literature. In this paper we give new criteria and…

Functional Analysis · Mathematics 2020-09-17 Frédéric Bayart , Fernando Costa Júnior , Dimitris Papathanasiou

Enhancing a recent result of Bayart and Ruzsa we obtain a Birkhoff-type characterization of upper frequently hypercyclic operators and a corresponding Upper Frequent Hypercyclicity Criterion. As an application we characterize upper…

Functional Analysis · Mathematics 2016-01-28 Antonio Bonilla , Karl-G. Grosse-Erdmann

Given a unilateral shift $B_w$ (determined by a bounded sequence $w$), a sequence $x \in \ell^2$ is "hypercyclic" for $w$ iff the forward iterates of $x$ under $B_w$ are dense in $\ell^2$. We show that it is possible to make the set of $x…

Logic · Mathematics 2020-06-11 Konstantinos A. Beros , Paul B. Larson

This paper explores the notions of $\mathcal{F}$-transitivity and topological $\mathcal{F}$-recurrence for backward shift operators on weighted $\ell^p$-spaces and $c_0$-spaces on directed trees, where $\mathcal{F}$ represents a Furstenberg…

Functional Analysis · Mathematics 2026-03-04 Evgeny Abakumov , Arafat Abbar

We characterize disjoint and simultaneously hypercyclic tuples of unilateral pseudo-shift operators on $\ell^p(\mathbb{N})$. As a consequence, complementing the results of Bernal and Jung, we give a characterization for simultaneously…

Functional Analysis · Mathematics 2021-12-10 Nurhan Çolakoğlu , Özgür Martin , Rebecca Sanders

In this paper we initiate the study of a fundamental yet untapped random model of non-selfadjoint, bounded linear operators acting on a separable complex Hilbert space. We replace the weights $w_n=1$ in the classical unilateral shift $T$,…

Functional Analysis · Mathematics 2018-11-15 Guozheng Cheng , Xiang Fang , Sen Zhu

We study the weak disjointness of hypercyclic operators to advance the classifications of hypercyclic operators. We establish an analogue of the Weiss-Akin-Glasner Theorem from topological dynamics within the framework of linear dynamics,…

Dynamical Systems · Mathematics 2025-12-10 Jian Li , Qijing Liao , Yonghang Ruan

In this paper, we generalize to the context of algebras some recent results on the existence of common hypercyclic vectors for families of products of backward shift operators. We also give, in a multi-dimensional setting, a positive answer…

Functional Analysis · Mathematics 2021-10-18 Fernando Costa

In this paper we study some dynamical properties such as Frequent Hypercyclicity Criterion, chaos, disjoint hypercyclicity and F-transitivity via Furstenberg family F for generalized bilateral weighted shift operator on the standard Hilbert…

Functional Analysis · Mathematics 2025-10-02 Song-Ung Ri , Hyon-Hui Ju , Jin-Myong Kim

We study the dynamical behaviour of weighted backward shift operators defined on sequence spaces over a directed tree. We provide a characterization of chaos on very general Fr\'echet sequence spaces in terms of the existence of a large…

Functional Analysis · Mathematics 2024-06-13 Karl-G. Grosse-Erdmann , Dimitris Papathanasiou

We give necessary and sufficient condition so that we have d-hypercyclicity for operators who map a holomorphic function to a partial sum of the Taylor expansion. This problem is connected with doubly universal Taylors series and this is an…

Complex Variables · Mathematics 2015-04-02 Vagia Vlachou

We study the existence of algebras of hypercyclic vectors for weighted backward shifts on Fr\'echet sequence spaces that are algebras when endowed with coordinatewise multiplication or with the Cauchy product. As a particular case we obtain…

Dynamical Systems · Mathematics 2018-07-13 Javier Falcó , Karl-G. Grosse-Erdmann

Let $I$ be a countably infinite index set, and let $X$ be a Banach sequence space over $I.$ In this article, we characterize disjoint hypercyclic and supercyclic weighted pseudo-shift operators on $X$ in terms of the weights, the OP-basis,…

Functional Analysis · Mathematics 2018-04-09 Ya Wang , Ze-Hua Zhou

We first give a note on disjoint hypercyclicity for invertible bilateral pseudo-shifts on $\ell^{p}(\mathbb{Z})$, $1\leq p <\infty$. It is already known that if a tuple of bilateral weighted shifts on $\ell^{p}(\mathbb{Z})$, $1\leq p…

Functional Analysis · Mathematics 2025-12-24 SongUng Ri , HyonHui Ju , JinMyong Kim
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