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Mathlib.CategoryTheory.MorphismProperty.LiftingProperty

Left and right lifting properties #

Given a morphism property T, we define the left and right lifting property with respect to T.

We show that the left lifting property is stable under retracts, cobase change, coproducts, and composition, with dual statements for the right lifting property.

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def CategoryTheory.MorphismProperty.llp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
MorphismProperty C

Given T : MorphismProperty C, this is the class of morphisms that have the left lifting property (llp) with respect to T.

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    def CategoryTheory.MorphismProperty.rlp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
    MorphismProperty C

    Given T : MorphismProperty C, this is the class of morphisms that have the right lifting property (rlp) with respect to T.

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      theorem CategoryTheory.MorphismProperty.llp_of_isIso {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) {A B : C} (i : A ⟶ B) [IsIso i] :
      T.llp i
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      theorem CategoryTheory.MorphismProperty.rlp_of_isIso {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) {X Y : C} (f : X ⟶ Y) [IsIso f] :
      T.rlp f
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      instance CategoryTheory.MorphismProperty.llp_isStableUnderRetracts {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.llp.IsStableUnderRetracts
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      instance CategoryTheory.MorphismProperty.rlp_isStableUnderRetracts {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.rlp.IsStableUnderRetracts
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      instance CategoryTheory.MorphismProperty.llp_isStableUnderCobaseChange {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.llp.IsStableUnderCobaseChange
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      instance CategoryTheory.MorphismProperty.rlp_isStableUnderBaseChange {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.rlp.IsStableUnderBaseChange
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      instance CategoryTheory.MorphismProperty.llp_isMultiplicative {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.llp.IsMultiplicative
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      instance CategoryTheory.MorphismProperty.rlp_isMultiplicative {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.rlp.IsMultiplicative
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      theorem CategoryTheory.MorphismProperty.llp_isStableUnderCoproductsOfShape {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) (J : Type u_1) :
      T.llp.IsStableUnderCoproductsOfShape J
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      theorem CategoryTheory.MorphismProperty.rlp_isStableUnderProductsOfShape {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) (J : Type u_1) :
      T.rlp.IsStableUnderProductsOfShape J
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      theorem CategoryTheory.MorphismProperty.le_llp_iff_le_rlp {C : Type u} [Category.{v, u} C] (T T' : MorphismProperty C) :
      T ≤ T'.llp ↔ T' ≤ T.rlp
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      theorem CategoryTheory.MorphismProperty.gc_llp_rlp {C : Type u} [Category.{v, u} C] :
      GaloisConnection (⇑OrderDual.toDual ∘ llp) (rlp ∘ ⇑OrderDual.ofDual)
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      theorem CategoryTheory.MorphismProperty.le_llp_rlp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T ≤ T.rlp.llp
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      @[simp]
      theorem CategoryTheory.MorphismProperty.rlp_llp_rlp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.rlp.llp.rlp = T.rlp
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      @[simp]
      theorem CategoryTheory.MorphismProperty.llp_rlp_llp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.llp.rlp.llp = T.llp
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      theorem CategoryTheory.MorphismProperty.antitone_rlp {C : Type u} [Category.{v, u} C] :
      Antitone rlp
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      theorem CategoryTheory.MorphismProperty.antitone_llp {C : Type u} [Category.{v, u} C] :
      Antitone llp
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      theorem CategoryTheory.MorphismProperty.pushouts_le_llp_rlp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.pushouts ≤ T.rlp.llp
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      @[simp]
      theorem CategoryTheory.MorphismProperty.rlp_pushouts {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.pushouts.rlp = T.rlp
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      theorem CategoryTheory.MorphismProperty.colimitsOfShape_discrete_le_llp_rlp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) (J : Type w) :
      T.colimitsOfShape (Discrete J) ≤ T.rlp.llp
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      theorem CategoryTheory.MorphismProperty.coproducts_le_llp_rlp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      coproducts.{w, v, u} T ≤ T.rlp.llp
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      @[simp]
      theorem CategoryTheory.MorphismProperty.rlp_coproducts {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      (coproducts.{w, v, u} T).rlp = T.rlp
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      theorem CategoryTheory.MorphismProperty.retracts_le_llp_rlp {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.retracts ≤ T.rlp.llp
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      @[simp]
      theorem CategoryTheory.MorphismProperty.rlp_retracts {C : Type u} [Category.{v, u} C] (T : MorphismProperty C) :
      T.retracts.rlp = T.rlp