š Source: Mathlib/Data/Set/Pairwise/Chain.lean
pairwiseDisjoint_iUnionā
pairwiseDisjoint_sUnion
pairwise_iUnionā
pairwise_sUnion
IsChain
Set
Set.instHasSubset
Set.PairwiseDisjoint
Set.iUnion
Set.instMembership
Set.sUnion
Set.Pairwise
Set.pairwise_iUnionā_iff
directedOn
Set.instReflSubset
Set.pairwise_sUnion
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