Question Number 117184 by Eric002 last updated on 10/Oct/20
$${let}\:{I}\:{be}\:{an}\:{interval}.{prove}\:{that} \\ $$$${c}^{\left(\infty\right)} \left({I}\right)=\underset{{n}=\mathrm{1}} {\overset{\infty} {\cap}}{c}^{{n}} \left({I}\right) \\ $$
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