( X, Ï„ ) is normal if and only if for each closed
subset C of...
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( X, τ ) is normal if and only if for each closedsubset C of X and each open set U such that C ⊆ U, there exists an open set V satisfies C ⊆ V⊆clu( V) ⊆ U
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Let be anormal topological space Using the same notation as that inquestion note that and
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