LeanCat / CAT_statement /S_0012.lean
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import Mathlib
open CategoryTheory Functor
theorem mono_iff_exists_embedding_section
{C : Type u} [Category.{v} C] {X Y : C} (f : XY) :
Mono f ↔ ∃ (D : Type (max u v)) (_ : Category.{v} D) (I : CD) (_ : Faithful I),
IsSplitMono (I.map f) := by
sorry