English

Weighted inversion of vector valued Dirichlet series

Functional Analysis 2025-09-23 v1 Spectral Theory

Abstract

Let Λ[0,)\Lambda\subset[0,\infty) be an additive semigroup with 0Λ0\in\Lambda, ω\omega be an admissible weight on Λ\Lambda, A\mathcal A be a unital Banach algebra, and let f(s)=λΛfλeλsf(s)=\sum_{\lambda\in\Lambda} f_\lambda e^{-\lambda s} for sH={j+itC:j0}s\in\mathcal{H}=\{j+it\in\mathbb{C}:j\geq0\} be a generalized Dirichlet series satisfying fω=λΛfλω(λ)<,\|f\|_\omega=\sum_{\lambda\in\Lambda}\|f_\lambda\|\omega(\lambda)<\infty, where fλAf_\lambda\in\mathcal{A} for all λΛ\lambda\in\Lambda. We take A\mathcal{A} to be a commutative complex Banach algebra (with Λ=logN\Lambda=\log\mathbb{N}) and Md(X)M_d(\mathcal{X}) - the Banach algebra of d×dd \times d matrices having entries from X\mathcal{X}, where X\mathcal{X} is either the complex plane or the real algebra of bicomplex numbers or quaternions, and show that ff is invertible if and only if the closure of the image of ff is contained in the set of all invertible elements of A\mathcal{A}.

Keywords

Cite

@article{arxiv.2509.16658,
  title  = {Weighted inversion of vector valued Dirichlet series},
  author = {Prakash A. Dabhi and Karishman B. Solanki},
  journal= {arXiv preprint arXiv:2509.16658},
  year   = {2025}
}

Comments

11 pages

R2 v1 2026-07-01T05:47:14.105Z