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  3. let x = r and a = {disjoint union of the intervals

Let X = R and A = {disjoint union of the intervals of the form (a,...

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Advance Math

Let X = R and A = {disjoint union of the intervals of the form(a, b], (−∞, b] and (a, + ∞)}. Prove that A is an algebra but not aσ-algebra.

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