Let (S) be any set and (mathscr{E}) be a family of subsets of (S). Show that [sigma(mathscr{E})=bigcup{sigma(mathscr{C}):

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Let \(S\) be any set and \(\mathscr{E}\) be a family of subsets of \(S\). Show that

\[\sigma(\mathscr{E})=\bigcup\{\sigma(\mathscr{C}): \mathscr{C} \subset \mathscr{E}, \mathscr{C} \text { is countable }\}\]

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