Question: Lety a set function defined on a o-algebra A of subsets of X. Show that it is additive and countably subadditive on A, then

Lety a set function defined on a o-algebra A of subsets of

Lety a set function defined on a o-algebra A of subsets of X. Show that it is additive and countably subadditive on A, then it is countably additive on A.

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