ThmDex – An index of mathematical definitions, results, and conjectures.
F9793
Formulation 0
Let $T = (X, \mathcal{T})$ be a D1106: Topological space such that
(i) $F_j \subseteq X$ is a D98: Closed set in $T$ for each $j \in J$
(i) $\bigcap_{j \in J} F_j$ is the D76: Set intersection of $F = \{ F_j \}_{j \in J}$
Then $\bigcap_{j \in J} F_j$ is a D98: Closed set in $T$.