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Mathlib.CategoryTheory.Adjunction.Limits

Adjunctions and limits #

A left adjoint preserves colimits (CategoryTheory.Adjunction.leftAdjointPreservesColimits), and a right adjoint preserves limits (CategoryTheory.Adjunction.rightAdjointPreservesLimits).

Equivalences create and reflect (co)limits. (CategoryTheory.Adjunction.isEquivalenceCreatesLimits, CategoryTheory.Adjunction.isEquivalenceCreatesColimits, CategoryTheory.Adjunction.isEquivalenceReflectsLimits, CategoryTheory.Adjunction.isEquivalenceReflectsColimits,)

In CategoryTheory.Adjunction.coconesIso we show that when F ⊣ G, the functor associating to each Y the cocones over K ⋙ F with cone point Y is naturally isomorphic to the functor associating to each Y the cocones over K with cone point G.obj Y.

The right adjoint of Cocones.functoriality K F : Cocone K ⥤ Cocone (K ⋙ F).

Auxiliary definition for functorialityIsLeftAdjoint.

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    The unit for the adjunction for Cocones.functoriality K F : Cocone K ⥤ Cocone (K ⋙ F).

    Auxiliary definition for functorialityIsLeftAdjoint.

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      The counit for the adjunction for Cocones.functoriality K F : Cocone K ⥤ Cocone (K ⋙ F).

      Auxiliary definition for functorialityIsLeftAdjoint.

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        The functor Cocones.functoriality K F : Cocone K ⥤ Cocone (K ⋙ F) is a left adjoint.

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          A left adjoint preserves colimits.

          See .

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            The left adjoint of Cones.functoriality K G : Cone K ⥤ Cone (K ⋙ G).

            Auxiliary definition for functorialityIsRightAdjoint.

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              The unit for the adjunction for Cones.functoriality K G : Cone K ⥤ Cone (K ⋙ G).

              Auxiliary definition for functorialityIsRightAdjoint.

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                The counit for the adjunction for Cones.functoriality K G : Cone K ⥤ Cone (K ⋙ G).

                Auxiliary definition for functorialityIsRightAdjoint.

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                  The functor Cones.functoriality K G : Cone K ⥤ Cone (K ⋙ G) is a right adjoint.

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                    A right adjoint preserves limits.

                    See .

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                      auxiliary construction for coconesIso

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                        auxiliary construction for coconesIso

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                          auxiliary construction for conesIso

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                            auxiliary construction for conesIso

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                              When F ⊣ G, the functor associating to each Y the cocones over K ⋙ F with cone point Y is naturally isomorphic to the functor associating to each Y the cocones over K with cone point G.obj Y.

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                                When F ⊣ G, the functor associating to each X the cones over K with cone point F.op.obj X is naturally isomorphic to the functor associating to each X the cones over K ⋙ G with cone point X.

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