English

On the numerical radius parallelism and the numerical radius Birkhoff orthogonality

Functional Analysis 2024-12-03 v1

Abstract

In this paper, we generalize the notions of numerical radius parallelism and numerical radius Birkhoff orthogonality, originally formulated for operators on Hilbert spaces, to operators on normed spaces. We then proceed to demonstrate their fundamental properties. Notably, our findings reveal that numerical radius parallelism lacks transitivity, and numerical radius Birkhoff orthogonality is neither left nor right additive. Additionally, we offer characterizations for both concepts. Furthermore, we establish a connection between numerical radius parallelism and numerical radius Birkhoff orthogonality.

Keywords

Cite

@article{arxiv.2412.01735,
  title  = {On the numerical radius parallelism and the numerical radius Birkhoff orthogonality},
  author = {Jiaye Bi and Huayou Xie and Yongjin Li},
  journal= {arXiv preprint arXiv:2412.01735},
  year   = {2024}
}
R2 v1 2026-06-28T20:20:07.926Z