[Step-by-Step] Suppose B ∈ σ(\mathcalA), for some collection \mathcalA of subsets. Show there exists a countable subcollection \mathcalA_B of
Question: Suppose \(B \in \sigma(\mathcal{A})\), for some collection \(\mathcal{A}\) of subsets. Show there exists a countable subcollection \(\mathcal{A}_{B}\) of \(\mathcal{A}\) such that \(B \in \sigma\left(\mathcal{A}_{B}\right)\).
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