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2023•arXiv (Cornell University)Open access

C-open Sets on Topological Spaces

Mesfer H. Alqahtani

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Abstract

An open (resp., closed) subset A of a topological space (X, T ) is called C-open (resp., C-closed) set if cl(A) \ A (resp., A \ int(A)) is a countable set. This paper aims to present the concept of C-open and C-closed sets. We first investigate their basic properties. Then, we found some operators such as interior, closure, limit, border, and frontier using C-open and C-closed sets. The relationships between them are clarified and discussed. Finally, we exhibit continuous maps and compact space defined using C-open and C-closed sets and scrutinize their main properties.

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What this paper is about

An open (resp., closed) subset A of a topological space (X, T ) is called C-open (resp., C-closed) set if cl(A) \ A (resp., A \ int(A)) is a countable set. This paper aims to present the concept of C-open and C-closed sets. We first investigate their basic properties. Then, we found some operators such as interior, closure, limit, border, and frontier using C-open and C-closed sets. The relationships between them are clarified and discussed. Finally, we exhibit continuous maps and compact space defined using C-open and C-closed sets and scrutinize their main properties.

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Available abstract

An open (resp., closed) subset A of a topological space (X, T ) is called C-open (resp., C-closed) set if cl(A) \ A (resp., A \ int(A)) is a countable set. This paper aims to present the concept of C-open and C-closed sets. We first investigate their basic properties. Then, we found some operators such as interior, closure, limit, border, and frontier using C-open and C-closed sets. The relationships between them are clarified and discussed. Finally, we exhibit continuous maps and compact space defined using C-open and C-closed sets and scrutinize their main properties.

Key concepts: Closed set, Open set, Topological space, Open and closed maps, Closure (psychology), Mathematics, Countable set, Space (punctuation)

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