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[Merged by Bors] - feat(Data/Set/Function): make mapsTo_univ a simp lemma #38287

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[Merged by Bors] - feat(Data/Set/Function): make mapsTo_univ a simp lemma #38287

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2 changes: 1 addition & 1 deletion Mathlib/Data/Set/Function.lean
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Expand Up @@ -206,7 +206,7 @@ theorem mapsTo_inter : MapsTo f s (t₁ ∩ t₂) ↔ MapsTo f s t₁ ∧ MapsTo
h.mono (Subset.refl s) inter_subset_right⟩,
fun h => h.1.inter h.2⟩

theorem mapsTo_univ (f : α → β) (s : Set α) : MapsTo f s univ := fun _ _ => trivial
@[simp] theorem mapsTo_univ (f : α → β) (s : Set α) : MapsTo f s univ := fun _ _ => trivial

theorem mapsTo_range (f : α → β) (s : Set α) : MapsTo f s (range f) :=
(mapsTo_image f s).mono (Subset.refl s) (image_subset_range _ _)
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