Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · 2505.02474

Topological Center of the Double Dual of the Orlicz Figà-Talamanca Herz Algebra

Arvish Dabra·N. Shravan Kumar
View original source ↗Read source document ↗Export metadata ↓

Abstract

Let $G$ a locally compact group and $(Φ,Ψ)$ be a complementary pair of Young functions. Let $A_Φ(G)$ be the Orlicz analogue of the classical Figà-Talamanca Herz algebra $A_p(G).$ In this article, we establish a necessary and sufficient condition for the equality $Λ(A_Φ(G)^{\ast\ast}) = A_Φ(G)$ to hold, where $Λ(A_Φ(G)^{\ast\ast})$ denotes the topological center of the double dual of $A_Φ(G)$ when equipped with the first Arens product. Furthermore, we prove several results concerning the semi-simplicity of the Banach algebras $A_Φ(G)^{\ast\ast}$ and $UCB_Ψ(\widehat{G})^\ast.$

Explore related subjects

math.FA

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Arvish Dabra, N. Shravan Kumar. 2025-09-10. Topological Center of the Double Dual of the Orlicz Figà-Talamanca Herz Algebra. https://arxiv.org/abs/2505.02474

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

The Weyl-von Neumann theorem for antilinear skew-self-adjoint operators

In this article, we prove the Weyl--von Neumann theorem for bounded antilinear skew-self-adjoint operators. More specifically, we prove the following: Let $A$ be a bounded antilinear skew-self-adjoint operator on a separable Hilbert space $H$ whose kernel is either even dimensional or infinite dimensional. Let $1 0$ there exists an antilinear block skew-diagonal operator $D$ and an antilinear skew-self-adjoint Schatten $p$-class operator $K$ such that $A=K+D$ with $\|K\|_{p}<ε$. As a consequence, we prove the Weyl--von Neumann theorem for complex skew-symmetric operators: Let $τ$ be a conjugation on $H$ and let $T$ be a bounded linear operator $τ$-skew-symmetric with $\dim N(T)=\infty$ or $\dim N(T)$ is even. Let $1 0$, there exists a $τ$-skew-symmetric Schatten $p$-class operator $K$, a skew-symmetric block diagonal operator $D$ and a unitary operator $U$ such that $T=K+UDU^{tr}$ and $\|K\|_{p}<ε$, where $U^{tr}$ is the transpose of $U$ with respect to an orthonormal basis ${\{e_n:n\in \mathbb N}\}$ such that $τ(e_n)=e_n$ for each $n\in \mathbb N$. Furthermore, the above result holds even without any assumption on the dimension of $N(T)$, provided that $N(T)=N(T^*)$.

math.FA↗
arXiv2026

Schur bounded patterns, submajorisation and operator Lipschitz functions

A Schur bounded pattern is a subset $S\subset \mathbb{N}^2$ such that Schur multiplication by every bounded function on $\mathbb{N}^2$ supported on $S$ defines a bounded linear operator in the norm of $\mathcal{B}(\ell_2(\mathbb{N})).$ Schur bounded patterns were characterised by Davidson-Donsig as being unions of row-bounded and column-bounded sets. We study the analogous question for sets $S$ such that element-wise multiplication by every bounded function on $S$ is bounded in ideals of compact operators that are not closed under submajorisation, in particular the Schatten ideals $\mathcal{L}_p$ with $0<p<1$ and the weak Schatten ideal $\mathcal{L}_{1,\infty}.$ Conversely we characterise the ideals that are not closed under submajorisation by their Schur bounded patterns. This has implications for the functions which are Lipschitz in the norm of ideals that are not closed under submajorisation. In particular such functions must be differentiable and have derivative that is asymptotically constant at infinity.

math.FA↗
arXiv2026

Derivatives of Tensor Products and Applications to Spaces $C(K^n,X)$

In this paper, we develop an abstract theory of derivatives for Banach spaces based on objects that we call \emph{bidual assignments}. This framework encompasses both the Semadeni derivative and the recently introduced Semadeni--Pełczyński derivative. More generally, suitable ideals of subsets of dual spaces give rise to a broad family of derivatives within this setting. We establish direct-sum and tensor-product formulas for these derivatives, showing that they behave naturally with respect to direct sums and injective tensor products. We then obtain explicit descriptions of derivatives associated with compact trees and finite products of compact lines. In particular, we compute iterated derivatives and use them to derive isomorphic invariants for vector-valued spaces of continuous functions. As one consequence, if $K=\prod_{i=1}^n K_i$ and $L=\prod_{j=1}^m L_j$, where $n,m\geq1$ and all the factors are compact lines of uncountable character, then, for $1\leq p,q<\infty$, \[ C(K,\ell_p)\sim C(L,\ell_q) \] implies that $n=m$ and $p=q$. We also establish classification results for spaces of the form $C(K^n,X)$. In particular, for uncountable ordinals $α$ and $β$, an integer $n\geq1$, and Banach spaces $X$ satisfying suitable rigidity assumptions, we prove that \[ C([0,α]^n,X)\sim C([0,β]^n,X) \quad\text{if and only if}\quad C([0,α])\sim C([0,β]). \] This extends Kislyakov's classification of the spaces $C([0,α])$ and its vector-valued extension due to Galego to finite powers of ordinal intervals.

math.FA↗