3- \( \left(R, \mathcal{T}_{\infty f f}\right) \) is a regular space.
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A topological space (X, T) is said to be regular if for each x ∈ X and closed set F in X such that x ∉ F, there exists disjoint open sets U and V in X such that x ∈ U and F ⊆ V. Show more…
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