## Frontier of a Set Topology

Frontier of a set A, where A is a Subset of a topological space (X, T) is denoted by Fr(A) and is defined as Fr(A)=cl(A)∩cl(…

Showing posts from October, 2023

Frontier of a set A, where A is a Subset of a topological space (X, T) is denoted by Fr(A) and is defined as Fr(A)=cl(A)∩cl(…

byNoman Yousaf
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Proof; As we know A⊆(A∪B) and B⊆(A∪B) ⇒ Int(A)⊆Int(A∪B) and In(B)⊆Int(A∪B) ∵ If A⊆B then Int(A)⊆Int(B) ⇒ (Int(A)∪Int(B))⊆In…

byNoman Yousaf
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