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Fill that the Lebesgue boolean algebra is a sigma-algebra #696

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2 changes: 1 addition & 1 deletion Analysis/MeasureTheory/Section_1_4_2.lean
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Expand Up @@ -30,7 +30,7 @@ def ConcreteBooleanAlgebra.isAtomic.isSigmaAlgebra {X: Type*} {B: ConcreteBoolea

/-- Exercise 1.4.11 -/
theorem LebesgueMeasurable.boolean_algebra.isSigmaAlgebra (d:ℕ) : (LebesgueMeasurable.boolean_algebra d).isSigmaAlgebra :=
by sorry
fun E hE => LebesgueMeasurable.countable_union hE

def LebesgueMeasurable.sigmaAlgebra (d:ℕ) : ConcreteSigmaAlgebra (EuclideanSpace' d) :=
(LebesgueMeasurable.boolean_algebra.isSigmaAlgebra d).toSigmaAlgebra
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