I don't know how to approach this problem because I'm dealing with a finite ring and not a σ-ring, so S is not closed to countable union. If something is not clear sorry because english is not my first language. Any help is appreciated. :))
2026-03-23 16:50:49.1774284649
If S is a finite ring of subsets of X and μ is finitely additive on S, then μ is σ-additive on S.
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