Journals / Hacettepe Journal of Mathematics and Statistics / 2017 / Cilt: 46 - Sayı: 1

A study on quasi-pseudometrics

Pages
33–52
Publication Date
2022-10-18
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

We observe that this space is bicomplete and exhibit various closedsubspaces of $( QPM(X), \tau((A_X)^s))$.In the second part of the paper, as a rough way to measure the asymmety of a quasi-pseudometric $f$ on a set $X$, we investigate some properties of the value $(A_X)^s(f,f^{-1}).

📌 3 Key Takeaways

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Objective & Hypothesis:We study some aspects of the space $QPM(X)$ of all quasi-pseudometrics on a set $X$ equipped with the extended $T_0$-quasi-metric $A_X(f,g)=\sup_{(x,y)\in X\times X}(f(x,y)-g(x,y))$ whenever $f,g\in QPM(X)$.
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Key Findings & Data:We study some aspects of the space $QPM(X)$ of all quasi-pseudometrics on a set $X$ equipped with the extended $T_0$-quasi-metric $A_X(f,g)=\sup_{(x,y)\in X\times X}(f(x,y)-g(x,y))$ whenever $f,g\in QPM(X)$.
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Conclusion & Impact:We observe that this space is bicomplete and exhibit various closedsubspaces of $( QPM(X), \tau((A_X)^s))$.In the second part of the paper, as a rough way to measure the asymmety of a quasi-pseudometric $f$ on a set $X$, we investigate some properties of the value $(A_X)^s(f,f^{-1}).
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:quasi-pseudometric · $T_0$-quasi-metric · nonnegatively weightable quasi-pseudometric

Abstract

We study some aspects of the space $QPM(X)$ of all quasi-pseudometrics on a set $X$ equipped with the extended $T_0$-quasi-metric $A_X(f,g)=\sup_{(x,y)\in X\times X}(f(x,y)-g(x,y))$ whenever $f,g\in QPM(X)$. We observe that this space is bicomplete and exhibit various closedsubspaces of $( QPM(X), \tau((A_X)^s))$.In the second part of the paper, as a rough way to measure the asymmety of a quasi-pseudometric $f$ on a set $X$, we investigate some properties of the value $(A_X)^s(f,f^{-1}).

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Cite This Article

DEMETRİOU, N., KÜNZİ, H. A. (2022). A study on quasi-pseudometrics. Hacettepe Journal of Mathematics and Statistics, Cilt: 46 - Sayı: 1, 33–52. https://ajindex.com/articles/529906

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References (5)

  1. C.A. Agyingi, P. Haihambo and H.-P.A. Künzi, Tight extensions of T0-quasi-metric spaces, in: V. Brattka, H. Diener, D. Spreen (Eds.), Logic, Computation, Hierarchies, Festschrift in Honour of V.L. Selivanov's 60th Birthday, Ontos Verlag, De Gruyter Berlin, Boston, 2014, pp. 922. C.A. Agyingi, P. Haihambo and H.-P.A. Künzi, Endpoints in T0-quasi-metric spaces: Part II, Abstract and Applied Analysis, Vol. 2013, Article ID 539573, 10 pages. G. Berthiaume, On quasi-uniformities in hyperspaces, Proc. Amer. Math. Soc. 66 (1977), 335343. M. Bukatin, R. Kopperman and S. Matthews, Some corollaries of the correspondence between partial metrics and multivalued equalities, Fuzzy Sets Systems 256 (2014), 57 72. M.J. Campión, E. Induráin, G. Ochoa and O. Valero, Functional equations related to weighable quasi-metrics, Hacettepe J. Mat. Stat. 44 (4) (2015), 775787. Ş. Cobzaş, Functional Analysis in Asymmetric Normed Spaces, Frontiers in Mathematics, Springer, Basel, 2012.
  2. P. Fletcher and W.F. Lindgren, Quasi-uniform Spaces, Dekker, New York, 1982.
  3. Y.U. Gaba and H.-P.A. Künzi, Splitting metrics by T0-quasi-metrics, Topology Appl. 193 (2015), 8496. Y.U. Gaba and H.-P.A. Künzi, Partially ordered metric spaces produced by T0-quasimetrics, Topology Appl. 202 (2016), 366383. J. Goubault-Larrecq, Non-Hausdorff Topology and Domain Theory, Selected Topics in Point-Set Topology, Cambridge University Press, Cambridge, 2013.
  4. D. Gronau, A remark on Sincov's functional equation, Not. S. Afr. Math. Soc. 31 (2000), 1-8.
  5. E. Kemajou, H.-P.A. Künzi and O.O. Otafudu, The Isbell-hull of a di-space, Topology Appl. 159 (2012), 24632475. H.-P.A. Künzi, An introduction to quasi-uniform spaces, Beyond Topology, Contemp. Math. 486 (2009), 239304. H.-P.A. Künzi and C. Makitu Kivuvu, A double completion for an arbitrary T0-quasimetric space, J. Logic Algebraic Programming 76 (2008), 251269. H.-P.A. Künzi and S. Romaguera, Weightable quasi-uniformities, Acta Math. Hungar. 136 (1-2), (2012), 107128. H.-P.A. Künzi and C. Ryser, The Bourbaki quasi-uniformity, Topology Proceedings 20 (1995), 161183. H.-P.A. Künzi and M. Sanchis, The Katetov construction modifi ed for a T0-quasi-metric space, Topology Appl. 159 (2012), 711720. H.-P.A. Künzi and V. Vajner, Weighted quasi-metrics, Ann. New York Acad. Sci. 728 (1994), 6477. H.-P. A. Künzi and F. Yıldız, Convexity structures in T0-quasi-metric spaces, Topology Appl. 200 (2016), 218. L. Nel, Continuity Theory, Springer, Switzerland, 2016. F. P