[Merged by Bors] - feat(data/set): add some lemmas #4263
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fpvandoorn
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Some lemmas about sets, mostly involving disjointness I also sneaked in the lemma `(λ x : α, y) = const α y` which is useful to rewrite with.
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Some lemmas about sets, mostly involving disjointness
I also sneaked in the lemma
(λ x : α, y) = const α ywhich is useful to rewrite with.