The Urysohn Extension Theorem for Bishop Spaces

Bishop’s notion of function space, here called Bishop space, is a function-theoretic analogue to the classical set-theoretic notion of topological space. Bishop introduced this concept in 1967, without exploring it, and Bridges revived the subject in 2012. The theory of Bishop spaces can be seen as...

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Bibliographic Details
Published inLogical Foundations of Computer Science Vol. 9537; pp. 299 - 316
Main Author Petrakis, Iosif
Format Book Chapter
LanguageEnglish
Published Switzerland Springer International Publishing AG 2015
Springer International Publishing
SeriesLecture Notes in Computer Science
Subjects
Bishop spaces
Constructive topology
Embeddings
Mathematical theory of computation
Urysohn extension theorem
Online AccessGet full text
ISBN3319276824
9783319276823
ISSN0302-9743
1611-3349
DOI10.1007/978-3-319-27683-0_21

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Summary:Bishop’s notion of function space, here called Bishop space, is a function-theoretic analogue to the classical set-theoretic notion of topological space. Bishop introduced this concept in 1967, without exploring it, and Bridges revived the subject in 2012. The theory of Bishop spaces can be seen as a constructive version of the theory of the ring of continuous functions. In this paper we define various notions of embeddings of one Bishop space to another and develop their basic theory in parallel to the classical theory of embeddings of rings of continuous functions. Our main result is the translation within the theory of Bishop spaces of the Urysohn extension theorem, which we show that it is constructively provable. We work within Bishop’s informal system of constructive mathematics $$\mathrm {BISH}$$ , inductive definitions with countably many premises included.
Bibliography:Original Abstract: Bishop’s notion of function space, here called Bishop space, is a function-theoretic analogue to the classical set-theoretic notion of topological space. Bishop introduced this concept in 1967, without exploring it, and Bridges revived the subject in 2012. The theory of Bishop spaces can be seen as a constructive version of the theory of the ring of continuous functions. In this paper we define various notions of embeddings of one Bishop space to another and develop their basic theory in parallel to the classical theory of embeddings of rings of continuous functions. Our main result is the translation within the theory of Bishop spaces of the Urysohn extension theorem, which we show that it is constructively provable. We work within Bishop’s informal system of constructive mathematics \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathrm {BISH}$$\end{document}, inductive definitions with countably many premises included.
ISBN:3319276824
9783319276823
ISSN:0302-9743
1611-3349
DOI:10.1007/978-3-319-27683-0_21