[Merged by Bors] - feat: smul_set_disjoint_iff
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Add a `simp` lemma about the group action on a set: `Disjoint (a • s) (a • t) ↔ Disjoint s t`. From AperiodicMonotilesLean.
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Add a
simplemma about the group action on a set:Disjoint (a • s) (a • t) ↔ Disjoint s t.From AperiodicMonotilesLean.