English

$M$-ideals in $H^\infty(\mathbb{D})$

Functional Analysis 2024-05-16 v2 Complex Variables Operator Algebras

Abstract

This article intends to initiate an investigation into the structure of MM-ideals in H(D)H^\infty(\mathbb{D}), where H(D)H^\infty(\mathbb{D}) denotes the Banach algebra of all bounded analytic functions on the open unit disc D\mathbb{D} in C\mathbb{C}. We introduce the notion of analytic primes and prove that MM-ideals in H(D)H^\infty(\mathbb{D}) are analytic primes. From Hilbert function space perspective, we additionally prove that MM-ideals in H(D)H^\infty(\mathbb{D}) are dense in the Hardy space. We show that outer functions play a key role in representing singly generated closed ideals in H(D)H^\infty(\mathbb{D}) that are MM-ideals. This is also relevant to MM-ideals in H(D)H^\infty(\mathbb{D}) that are finitely generated closed ideals in H(D)H^\infty(\mathbb{D}). We analyze pp-sets of H(D)H^\infty(\mathbb{D}) and their connection to the \v{S}ilov boundary of the maximal ideal space of H(D)H^\infty(\mathbb{D}). Some of our results apply to the polydisc. In addition to addressing questions regarding MM-ideals, the results presented in this paper offer some new perspectives on bounded analytic functions.

Keywords

Cite

@article{arxiv.2403.16947,
  title  = {$M$-ideals in $H^\infty(\mathbb{D})$},
  author = {Deepak K. D and Jaydeb Sarkar and Sreejith Siju},
  journal= {arXiv preprint arXiv:2403.16947},
  year   = {2024}
}

Comments

Corrected and thoroughly revised. 34 pages

R2 v1 2026-06-28T15:33:00.138Z