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1 changed files with 11 additions and 11 deletions
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@ -43,7 +43,7 @@ namespace category
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theorem id_left : Π {A B : ob} {f : mor A B}, id ∘ f = f :=
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theorem id_left : Π {A B : ob} {f : mor A B}, id ∘ f = f :=
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rec (λ mor comp id assoc idr idl, idl) Cat
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rec (λ mor comp id assoc idr idl, idl) Cat
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theorem id_compose : (ID A) ∘ id = id :=
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theorem id_compose {A : ob} : (ID A) ∘ id = id :=
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id_left
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id_left
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theorem left_id_unique (i : mor A A) (H : Π{B} {f : mor B A}, i ∘ f = f) : i = id :=
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theorem left_id_unique (i : mor A A) (H : Π{B} {f : mor B A}, i ∘ f = f) : i = id :=
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@ -125,18 +125,18 @@ namespace category
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theorem iso_of_id {A : ob} : ID A⁻¹ = id :=
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theorem iso_of_id {A : ob} : ID A⁻¹ = id :=
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left_inverse_eq_right_inverse inverse_compose id_compose
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left_inverse_eq_right_inverse inverse_compose id_compose
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theorem composition_is_section [instance] {f : mor A B} {g : mor B C}
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theorem composition_is_section [instance] {f : mor A B} {g : mor B C}
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(Hf : is_section f) (Hg : is_section g) : is_section (g ∘ f) :=
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(Hf : is_section f) (Hg : is_section g) : is_section (g ∘ f) :=
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is_section.mk
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is_section.mk
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(calc
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(calc
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(retraction_of f ∘ retraction_of g) ∘ g ∘ f
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(retraction_of f ∘ retraction_of g) ∘ g ∘ f
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= retraction_of f ∘ retraction_of g ∘ g ∘ f : symm assoc
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= retraction_of f ∘ retraction_of g ∘ g ∘ f : symm assoc
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... = retraction_of f ∘ (retraction_of g ∘ g) ∘ f : {assoc}
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... = retraction_of f ∘ (retraction_of g ∘ g) ∘ f : {assoc}
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... = retraction_of f ∘ id ∘ f : {retraction_compose}
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... = retraction_of f ∘ id ∘ f : {retraction_compose}
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... = retraction_of f ∘ f : {id_left}
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... = retraction_of f ∘ f : {id_left}
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... = id : retraction_compose)
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... = id : retraction_compose)
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theorem composition_is_retraction [instance] {f : mor A B} {g : mor B C}
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theorem composition_is_retraction [instance] {f : mor A B} {g : mor B C}
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(Hf : is_retraction f) (Hg : is_retraction g) : is_retraction (g ∘ f) :=
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(Hf : is_retraction f) (Hg : is_retraction g) : is_retraction (g ∘ f) :=
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is_retraction.mk
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is_retraction.mk
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(calc
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(calc
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@ -146,7 +146,7 @@ namespace category
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... = g ∘ section_of g : {id_left}
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... = g ∘ section_of g : {id_left}
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... = id : compose_section)
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... = id : compose_section)
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theorem composition_is_inverse [instance] {f : mor A B} {g : mor B C}
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theorem composition_is_inverse [instance] {f : mor A B} {g : mor B C}
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(Hf : is_iso f) (Hg : is_iso g) : is_iso (g ∘ f) :=
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(Hf : is_iso f) (Hg : is_iso g) : is_iso (g ∘ f) :=
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section_retraction_imp_iso _ _
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section_retraction_imp_iso _ _
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@ -156,7 +156,7 @@ namespace category
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∀⦃C⦄ {g h : mor B C}, g ∘ f = h ∘ f → g = h
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∀⦃C⦄ {g h : mor B C}, g ∘ f = h ∘ f → g = h
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theorem section_is_mono {f : mor A B} (H : is_section f) : mono f :=
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theorem section_is_mono {f : mor A B} (H : is_section f) : mono f :=
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λ C g h H,
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λ C g h H,
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calc
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calc
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g = id ∘ g : symm id_left
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g = id ∘ g : symm id_left
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... = (retraction_of f ∘ f) ∘ g : {symm retraction_compose}
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... = (retraction_of f ∘ f) ∘ g : {symm retraction_compose}
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@ -167,7 +167,7 @@ namespace category
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... = h : id_left
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... = h : id_left
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theorem retraction_is_epi {f : mor A B} (H : is_retraction f) : epi f :=
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theorem retraction_is_epi {f : mor A B} (H : is_retraction f) : epi f :=
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λ C g h H,
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λ C g h H,
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calc
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calc
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g = g ∘ id : symm id_right
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g = g ∘ id : symm id_right
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... = g ∘ f ∘ section_of f : {symm compose_section}
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... = g ∘ f ∘ section_of f : {symm compose_section}
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@ -200,14 +200,14 @@ namespace category
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-- check g ∘ f
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-- check g ∘ f
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-- check f ∘op g
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-- check f ∘op g
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-- check f ∘op g = g ∘ f
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-- check f ∘op g = g ∘ f
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-- theorem compose_op : f ∘op g = g ∘ f :=
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-- theorem compose_op : f ∘op g = g ∘ f :=
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-- rfl
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-- rfl
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-- theorem compose_op {C : category ob} {a b c : ob} {f : @mor ob C a b} {g : @mor ob C b c} : f ∘op g = g ∘ f :=
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-- theorem compose_op {C : category ob} {a b c : ob} {f : @mor ob C a b} {g : @mor ob C b c} : f ∘op g = g ∘ f :=
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-- rfl
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-- rfl
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-- theorem op_op {C : category ob} : opposite (opposite C) = C :=
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-- theorem op_op {C : category ob} : opposite (opposite C) = C :=
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-- rec (λ mor comp id assoc idl idr, sorry) C
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-- rec (λ mor comp id assoc idl idr, sorry) C
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end
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end
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section
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section
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--need extensionality
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--need extensionality
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