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2023/102/3-4 (15) — DOI: 10.5486/PMD.2023.9558 — pp. 507-524

Ordered continuous bands on the positive real numbers and distribution

Authors: Hirokazu Oka, Takeshi Miura, Norio Niwa and Sin-Ei Takahasi

Abstract:

Let $\mathbf R_+$ be the space of positive numbers with the ordinary topology and the ordinary order, and let $\ddagger$ be any ordered continuous band on $\mathbf R_+$. We show that there is no cancellative continuous semigroup operation on $\mathbf R_+$ which is distributed by $\ddagger$. Additionally, we show that if $\ddagger$ is not homeomorphically isomorphic to any of three bands called $\it{min}$, $\it{left}$-$\it{zero}$ and $\it{right}$-$\it{zero}$, then there is no cancellative continuous semigroup operation on $\mathbf R_+$ which is distributive over $\ddagger$. Moreover, we show that if $\ddagger$ is homeomorphically isomorphic to any of these three bands, then all cancellative continuous semigroup operations on $\mathbf R_+$ are distributive over $\ddagger$.

Keywords: cancellative continuous semigroup operation, ordered continuous band, distribution law, homeomorphic isomorphism

Mathematics Subject Classification: 22A15, 06F05