Projection lateral bands and lateral retracts

  • A. Kamińska Pomeranian University in Słupsk, 76-200, Słupsk, Poland
  • I. Krasikova Zaporizhzhya National University, 66 Zukovs'koho str., 69600, Zaporizhzhya, Ukraine
  • M. Popov Vasyl Stefanyk Precarpathian National University, 57 Shevchenka str., 76018, Ivano-Frankivsk, Ukraine, Pomeranian University in Słupsk, 76-200, Słupsk, Poland https://orcid.org/0000-0002-3165-5822
Keywords: orthogonally additive operator, Riesz space, lateral band
Published online: 2020-12-06

Abstract


A projection lateral band $G$ in a Riesz space $E$ is defined to be a lateral band which is the image of an orthogonally additive projection $Q: E \to E$ possessing the property that $Q(x)$ is a fragment of $x$ for all $x \in E$, called a lateral retraction of $E$ onto $G$ (which is then proved to be unique). We investigate properties of lateral retracts, that are, images of lateral retractions, and describe lateral retractions onto principal projection lateral bands (i.e. lateral bands generated by single elements) in a Riesz space with the principal projection property. Moreover, we prove that every lateral retract is a lateral band, and every lateral band in a Dedekind complete Riesz space is a projection lateral band.

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