Fill sigma-algebra order, infima, and the Mathlib union bridge - #692
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Fill sigma-algebra order, infima, and the Mathlib union bridge#692Chessing234 wants to merge 1 commit into
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The order is the same pointwise inclusion as the boolean-algebra instance; finite union in MeasurableSpace is a two-term countable union.
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Summary
sigmaAlgebra.Test plan
lake build Analysis.MeasureTheory.Section_1_4_2; CI covers the module.