Complete Invariant ⋆-Metrics on Semigroups and Groups

Autor: Shi-Yao He, Jian-Cai Wei, Li-Hong Xie
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Axioms, Vol 11, Iss 10, p 546 (2022)
Druh dokumentu: article
ISSN: 2075-1680
DOI: 10.3390/axioms11100546
Popis: In this paper, we study the complete ⋆-metric semigroups and groups and the Raǐkov completion of invariant ⋆-metric groups. We obtain the following. (1) Let (X,d⋆) be a complete ⋆-metric space containing a semigroup (group) G that is a dense subset of X. If the restriction of d⋆ on G is invariant, then X can become a semigroup (group) containing G as a subgroup, and d⋆ is invariant on X. (2) Let (G,d⋆) be a ⋆-metric group such that d⋆ is invariant on G. Then, (G,d⋆) is complete if and only if (G,τd⋆) is Raǐkov complete.
Databáze: Directory of Open Access Journals
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