Let (X) be an arbitrary set and (mathscr{F} subset mathscr{P}(X)). Show that [sigma(mathscr{F})=bigcup{sigma(mathscr{C}): mathscr{C} subset mathscr{F} text

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Let \(X\) be an arbitrary set and \(\mathscr{F} \subset \mathscr{P}(X)\). Show that

\[\sigma(\mathscr{F})=\bigcup\{\sigma(\mathscr{C}): \mathscr{C} \subset \mathscr{F} \text { countable sub-family }\}\]

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