[Merged by Bors] - feat(Data/Set/Pairwise/Basic): pairwise disjoint sets and subsingletons #11629
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Add a lemma giving a characterization of pairwise disjoint sets in
terms of each value lying in at most one set:
```lean
lemma subsingleton_setOf_mem_iff_pairwise_disjoint {f : ι → Set α} :
(∀ a, {i | a ∈ f i}.Subsingleton) ↔ Pairwise (Disjoint on f) :=
```
From AperiodicMonotilesLean.
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…ns (#11629) Add a lemma giving a characterization of pairwise disjoint sets in terms of each value lying in at most one set: ```lean lemma subsingleton_setOf_mem_iff_pairwise_disjoint {f : ι → Set α} : (∀ a, {i | a ∈ f i}.Subsingleton) ↔ Pairwise (Disjoint on f) := ``` From AperiodicMonotilesLean.
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Louddy
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…ns (#11629) Add a lemma giving a characterization of pairwise disjoint sets in terms of each value lying in at most one set: ```lean lemma subsingleton_setOf_mem_iff_pairwise_disjoint {f : ι → Set α} : (∀ a, {i | a ∈ f i}.Subsingleton) ↔ Pairwise (Disjoint on f) := ``` From AperiodicMonotilesLean.
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…ns (#11629) Add a lemma giving a characterization of pairwise disjoint sets in terms of each value lying in at most one set: ```lean lemma subsingleton_setOf_mem_iff_pairwise_disjoint {f : ι → Set α} : (∀ a, {i | a ∈ f i}.Subsingleton) ↔ Pairwise (Disjoint on f) := ``` From AperiodicMonotilesLean.
uniwuni
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Apr 19, 2024
…ns (#11629) Add a lemma giving a characterization of pairwise disjoint sets in terms of each value lying in at most one set: ```lean lemma subsingleton_setOf_mem_iff_pairwise_disjoint {f : ι → Set α} : (∀ a, {i | a ∈ f i}.Subsingleton) ↔ Pairwise (Disjoint on f) := ``` From AperiodicMonotilesLean.
callesonne
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Apr 22, 2024
…ns (#11629) Add a lemma giving a characterization of pairwise disjoint sets in terms of each value lying in at most one set: ```lean lemma subsingleton_setOf_mem_iff_pairwise_disjoint {f : ι → Set α} : (∀ a, {i | a ∈ f i}.Subsingleton) ↔ Pairwise (Disjoint on f) := ``` From AperiodicMonotilesLean.
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Add a lemma giving a characterization of pairwise disjoint sets in terms of each value lying in at most one set:
From AperiodicMonotilesLean.