English

Commuting maps with the Mean Transform under Jordan product

Functional Analysis 2022-03-30 v1

Abstract

In this article, we give a complete characterization of the bijective maps which commute with the mean transform under Jordan product. The main result is the following : Let H,KH,K be two complex Hilbert spaces and Φ:B(H)B(K)\Phi :B(H) \to B(K) be a bijective map, then M(Φ(A)Φ(B))=Φ(M(AB))    for all    A,BB(H) \mathcal {M}(\Phi(A)\circ\Phi(B))=\Phi(\mathcal{M}(A\circ B)) \;\; \text{for all}\;\; A, B \in B(H) if and only if there exists a unitary or anti-unitary operator U:HKU:H\to K such that, Φ(T)=UTU  for all  TB(H). \Phi(T)= UTU^* \; \text{for all} \;T\in B(H).

Keywords

Cite

@article{arxiv.2203.15715,
  title  = {Commuting maps with the Mean Transform under Jordan product},
  author = {Fadil Chabbabi},
  journal= {arXiv preprint arXiv:2203.15715},
  year   = {2022}
}
R2 v1 2026-06-24T10:30:33.561Z