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Horizontal Egorov property of Riesz spaces


Author: Mikhail Popov
Journal: Proc. Amer. Math. Soc. 149 (2021), 323-332
MSC (2010): Primary 46A40; Secondary 46B42
DOI: https://doi.org/10.1090/proc/15235
Published electronically: October 20, 2020
MathSciNet review: 4172608
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Abstract: We say that a Riesz space $E$ has the horizontal Egorov property if for every net $(f_\alpha )$ in $E$, order convergent to $f \in E$ with $|f_\alpha | + |f| \le e \in E^+$ for all $\alpha$, there exists a net $(e_\beta )$ of fragments of $e$ laterally convergent to $e$ such that for every $\beta$, the net $\bigl (|f - f_\alpha | \wedge e_\beta \bigr )_\alpha$ $e$-uniformly tends to zero. Our main result asserts that every Dedekind complete Riesz space which satisfies the weak distributive law possesses the horizontal Egorov property. A Riesz space $E$ is said to satisfy the weak distributive law if for every $e \in E^+ \setminus \{0\}$ the Boolean algebra $\mathfrak {F}_e$ of fragments of $e$ satisfies the weak distributive law; that is, whenever $(\Pi _n)_{n \in \mathbb N}$ is a sequence of partitions of $\mathfrak {F}_e$, there is a partition $\Pi$ of $\mathfrak {F}_e$ such that every element of $\Pi$ is finitely covered by each of $\Pi _n$ (e.g., every measurable Boolean algebra is so). Using a new technical tool, we show that for every net $(f_\alpha )$ order convergent to $f$ in a Riesz space with the horizontal Egorov property there are a horizontally vanishing net $(v_\beta )$ and a net $(u_{\alpha , \beta })_{(\alpha , \beta ) \in A \times B}$, which uniformly tends to zero for every fixed $\beta$ such that $|f - f_\alpha | \le u_{\alpha , \beta } + v_\beta$ for all $\alpha , \beta$.


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Mikhail Popov
Affiliation: Institute of Exact and Technical Sciences, Pomeranian University in Słupsk, ul. Arciszewskiego 22d, PL-76-200 Słupsk, Poland; Vasyl Stefanyk Precarpathian National University, 57 Shevchenko str, Ivano-Frankivsk, 76018 Ukraine.
MR Author ID: 192683
ORCID: 0000-0002-3165-5822
Email: misham.popov@gmail.com

Keywords: Riesz space, order convergence, uniform order convergence
Received by editor(s): March 14, 2020
Received by editor(s) in revised form: April 18, 2020, June 8, 2020, and June 11, 2020
Published electronically: October 20, 2020
Communicated by: Stephen Dilworth
Article copyright: © Copyright 2020 American Mathematical Society