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blake-farman
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Updated name for rightOrthogonal_cokernel_sSup
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  • Mathlib/CategoryTheory/Abelian/TorsionTheory

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Mathlib/CategoryTheory/Abelian/TorsionTheory/Basic.lean

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@@ -132,7 +132,7 @@ lemma le_leftOrthogonal_rightOrthogonal (P : ObjectProperty C) :
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/-- If `P` is closed under quotients, extensions, and coproducts, then for any `X`,
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the cokernel of the maximal `P`-subobject's arrow is `P.rightOrthogonal`. -/
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lemma rightOrthogonal_cokernel_sSupOfP (P : ObjectProperty C)
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lemma rightOrthogonal_cokernel_sSup (P : ObjectProperty C)
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[P.IsClosedUnderQuotients] [P.IsClosedUnderExtensions]
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[∀ J : Type w, P.IsClosedUnderColimitsOfShape (Discrete J)]
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[LocallySmall.{w} C] [WellPowered.{w} C] [HasCoproducts.{w} C]
@@ -176,7 +176,7 @@ lemma rightOrthogonal_leftOrthogonal_le (P : ObjectProperty C)
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P.rightOrthogonal.leftOrthogonal ≤ P :=
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fun X hX ↦
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haveI : Epi (sSup P X).arrow :=
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Preadditive.epi_of_cokernel_zero (hX (cokernel.π _) (rightOrthogonal_cokernel_sSupOfP P X))
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Preadditive.epi_of_cokernel_zero (hX (cokernel.π _) (rightOrthogonal_cokernel_sSup P X))
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P.prop_of_epi (sSup P X).arrow (sSup_prop P X)
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/-- If an object property `P` in an abelian category is closed under quotients, extensions,
@@ -283,6 +283,7 @@ theorem isTorsionClass_iff {P : ObjectProperty C} [LocallySmall.{w} C] [WellPowe
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exact ⟨P.rightOrthogonal,
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{ torsion_eq_leftOrthogonal := eq_rightOrthogonal_leftOrthogonal P,
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free_eq_rightOrthogonal := rfl }⟩
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end TorsionTheory
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end CategoryTheory.Abelian

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