S. Noor

activity

20112024

most citedComplex symmetric composition operators

2 citations · 2 across the 10 of their papers we have counts for

collaborators

11 papers

math.FA2024

Beurling and Model subspaces invariant under a universal operator

Ben Hur Eidt, S. Waleed Noor, Waleed Noor

We classify the Beurling and model subspaces of the Hardy space $H^{2} (D)$ that are invariant under the composition operators $C_{ϕ_{a}}$ , where $ϕ_{a} (z) = a z + 1 - a$ and $0 < a < 1$ . Th…

math.FA2023

Minimal invariant subspaces for an affine composition operator

João R. Carmo, Ben Hur Eidt, S. Waleed Noor

The composition operator $C_{ϕ_{a}} f = f \circ ϕ_{a}$ on the Hardy-Hilbert space $H^{2} (D)$ with affine symbol $ϕ_{a} (z) = a z + 1 - a$ and $0 < a < 1$ has the property that the Invariant Subspa…

math.NT2022

Zero-free half-planes of the ζ-function via spaces of analytic functions

Aditya Ghosh, Kobi Kremnizer, S. Waleed Noor +1

In this article, we introduce a general approach for deriving zero-free half-planes for the Riemann zeta function $ζ$ by identifying topological vector spaces of analytic functions…

math.FA2020

Interplay between complex symmetry and Koenigs eigenfunctions

S. Waleed Noor, Osmar R. Severiano

We investigate the relationship between the complex symmetry of composition operators $C_{ϕ} f = f \circ ϕ$ induced on the classical Hardy space $H^{2} (D)$ by an analytic self-map…

math.FA2020

Universal Toeplitz operators on the Hardy space over the polydisk

Marcos Ferreira, S. Waleed Noor

The Invariant Subspace Problem (ISP) for Hilbert spaces asks if every bounded linear operator has a non-trivial closed invariant subspace. Due to the existence of universal operato…

math.FA2019

Universal composition operators

João R. Carmo, S. Waleed Noor

A Hilbert space operator $U$ is called universal (in the sense of Rota) if every Hilbert space operator is similar to a multiple of $U$ restricted to one of its invariant subspaces…

math.FA2019

Complex symmetry and cyclicity of composition operators on $H^{2} (C_{+})$

S. Waleed Noor, Osmar R. Severiano

In this article, we completely characterize the complex symmetry, cyclicity and hypercyclicity of composition operators $C_{ϕ} f = f \circ ϕ$ induced by affine self-maps $ϕ$ of the right…

math.FA2013★ 2 cited

Complex symmetric composition operators

S. Waleed Noor

Let $φ$ be a linear fractional self-map of the open unit disk $D$ and $H^{2}$ the Hardy space of analytic functions on $D$ . The goal of this article is to character…

math.FA2012

Complex symmetry of Composition operators induced by involutive Ball automorphisms

S. Waleed Noor

Suppose $H$ is a weighted Hardy space of analytic functions on the unit ball $B_{n} \subset C^{n}$ such that the composition operator $C_{ψ}$ defined by $C_ψf=f…

math.FA2012

Embeddings of Müntz Spaces: Composition Operators

S. Waleed Noor

Given a strictly increasing sequence $Λ = (λ_{n})$ of nonegative real numbers, with $\sum_{n = 1}^{\infty} \frac{1}{λ _{n}} < \infty$ , the Müntz spaces $M_{Λ}^{p}$ are defined as the closure in $L^…

math.FA2011

Embeddings of Müntz spaces: the Hilbertian case

S. Waleed Noor, Dan Timotin

Beurling and Model subspaces invariant under a universal operator

Minimal invariant subspaces for an affine composition operator

Zero-free half-planes of the ζ-function via spaces of analytic functions

Interplay between complex symmetry and Koenigs eigenfunctions

Universal Toeplitz operators on the Hardy space over the polydisk

Universal composition operators

Complex symmetry and cyclicity of composition operators on H2(C+​)

Complex symmetric composition operators

Complex symmetry of Composition operators induced by involutive Ball automorphisms

Embeddings of Müntz Spaces: Composition Operators

Embeddings of Müntz spaces: the Hilbertian case

Complex symmetry and cyclicity of composition operators on $H^{2} (C_{+})$