Invertible positive maps that are not automorphism
Functional Analysis
2026-05-15 v1
Abstract
Let be a real normed vector space with a cone satisfying either (i) is closed with non-empty interior or (ii) has non-zero extremals or (iii) is closed and is a Banach space. In this short note, we provide a method to construct an invertible linear map such that but . In particular, we show that, for every cone automorphism , there exists a rank one perturbation of which is positive and invertible, but does not have a positive inverse. We provide examples from four diverse situations.
Keywords
Cite
@article{arxiv.2605.14739,
title = {Invertible positive maps that are not automorphism},
author = {Pavankumar Raickwade and K. C. Sivakumar},
journal= {arXiv preprint arXiv:2605.14739},
year = {2026}
}
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9 Pages