definition POW': objs1 SET → OAlgebra.
intro A; constructor 1;
- [ apply (Ω \sup A);
+ [ apply (Ω^A);
| apply subseteq;
| apply overlaps;
| apply big_intersects;
[ assumption
| whd; intros; cases i; simplify; assumption]
| intros; split; intro;
- [ cases f; cases x1; exists [apply w1] exists [apply w] assumption;
+ [ (** screenshot "screen-pow". *) cases f; cases x1; exists [apply w1] exists [apply w] assumption;
| cases e; cases x; exists; [apply w1] [ assumption | exists; [apply w] assumption]]
| intros; intros 2; cases (f {(a)} ?);
[ exists; [apply a] [assumption | change with (a = a); apply refl1;]
assumption]]
qed.
-definition powerset_of_POW': ∀A.oa_P (POW' A) → Ω \sup A ≝ λA,x.x.
+definition powerset_of_POW': ∀A.oa_P (POW' A) → Ω^A ≝ λA,x.x.
coercion powerset_of_POW'.
-definition orelation_of_relation: ∀o1,o2:REL. arrows1 ? o1 o2 → arrows2 OA (POW' o1) (POW' o2).
+definition orelation_of_relation: ∀o1,o2:REL. o1 ⇒_\r1 o2 → (POW' o1) ⇒_\o2 (POW' o2).
intros;
constructor 1;
[ constructor 1;
qed.
lemma orelation_of_relation_preserves_equality:
- ∀o1,o2:REL.∀t,t': arrows1 ? o1 o2. t = t' → eq2 ? (orelation_of_relation ?? t) (orelation_of_relation ?? t').
+ ∀o1,o2:REL.∀t,t': o1 ⇒_\r1 o2.
+ t = t' → orelation_of_relation ?? t =_2 orelation_of_relation ?? t'.
intros; split; unfold orelation_of_relation; simplify; intro; split; intro;
simplify; whd in o1 o2;
[ change with (a1 ∈ minus_star_image ?? t a → a1 ∈ minus_star_image ?? t' a);
qed.
lemma orelation_of_relation_preserves_identity:
- ∀o1:REL. eq2 ? (orelation_of_relation ?? (id1 ? o1)) (id2 OA (POW' o1)).
+ ∀o1:REL. orelation_of_relation ?? (id1 ? o1) =_2 id2 OA (POW' o1).
intros; split; intro; split; whd; intro;
[ change with ((∀x. x ♮(id1 REL o1) a1→x∈a) → a1 ∈ a); intros;
apply (f a1); change with (a1 = a1); apply refl1;
alias symbol "eq" = "setoid2 eq".
alias symbol "compose" = "category1 composition".
lemma orelation_of_relation_preserves_composition:
- ∀o1,o2,o3:REL.∀F: arrows1 ? o1 o2.∀G: arrows1 ? o2 o3.
- orelation_of_relation ?? (G ∘ F) =
- comp2 OA (POW' o1) (POW' o2) (POW' o3)
- ?? (*(orelation_of_relation ?? F) (orelation_of_relation ?? G)*).
- [ apply (orelation_of_relation ?? F); | apply (orelation_of_relation ?? G); ]
+ ∀o1,o2,o3:REL.∀F: o1 ⇒_\r1 o2.∀G: o2 ⇒_\r1 o3.
+ orelation_of_relation ?? (G ∘ F) =
+ comp2 OA ??? (orelation_of_relation ?? F) (orelation_of_relation ?? G).
intros; split; intro; split; whd; intro; whd in ⊢ (% → %); intros;
[ whd; intros; apply f; exists; [ apply x] split; assumption;
| cases f1; clear f1; cases x1; clear x1; apply (f w); assumption;
theorem POW_faithful:
∀S,T.∀f,g:arrows2 (category2_of_category1 REL) S T.
- map_arrows2 ?? POW ?? f = map_arrows2 ?? POW ?? g → f=g.
+ POW⎽⇒ f =_2 POW⎽⇒ g → f =_2 g.
intros; unfold POW in e; simplify in e; cases e;
unfold orelation_of_relation in e3; simplify in e3; clear e e1 e2 e4;
intros 2; cases (e3 {(x)});
|*: cases Hletin; cases x1; change in f3 with (x =_1 w); apply (. f3‡#); assumption;]
qed.
-interpretation "lifting singl" 'singl x =
- (fun11 _ (objs2 (POW _)) (singleton _) x).
-theorem POW_full: ∀S,T.∀f. exT22 ? (λg. map_arrows2 ?? POW S T g = f).
+lemma currify: ∀A,B,C. (A × B ⇒_1 C) → A → (B ⇒_1 C).
+intros; constructor 1; [ apply (b c); | intros; apply (#‡e);]
+qed.
+
+theorem POW_full: ∀S,T.∀f: (POW S) ⇒_\o2 (POW T) . exT22 ? (λg. POW⎽⇒ g = f).
intros; exists;
[ constructor 1; constructor 1;
[ apply (λx:carr S.λy:carr T. y ∈ f {(x)});
lapply (#‡prop11 ?? f ?? (†e)); [6: apply Hletin; |*:skip ]]
| whd; split; whd; intro; simplify; unfold map_arrows2; simplify;
[ split;
- [ change with (∀a1.(∀x. a1 ∈ f (singleton S x) → x ∈ a) → a1 ∈ f⎻* a);
- | change with (∀a1.a1 ∈ f⎻* a → (∀x.a1 ∈ f (singleton S x) → x ∈ a)); ]
+ [ change with (∀a1.(∀x. a1 ∈ (f {(x):S}) → x ∈ a) → a1 ∈ f⎻* a);
+ | change with (∀a1.a1 ∈ f⎻* a → (∀x.a1 ∈ f {(x):S} → x ∈ a)); ]
| split;
- [ change with (∀a1.(∃y:carr T. y ∈ f (singleton S a1) ∧ y ∈ a) → a1 ∈ f⎻ a);
- | change with (∀a1.a1 ∈ f⎻ a → (∃y:carr T.y ∈ f (singleton S a1) ∧ y ∈ a)); ]
+ [ change with (∀a1.(∃y:carr T. y ∈ f {(a1):S} ∧ y ∈ a) → a1 ∈ f⎻ a);
+ | change with (∀a1.a1 ∈ f⎻ a → (∃y:carr T.y ∈ f {(a1):S} ∧ y ∈ a)); ]
| split;
- [ change with (∀a1.(∃x:carr S. a1 ∈ f (singleton S x) ∧ x ∈ a) → a1 ∈ f a);
- | change with (∀a1.a1 ∈ f a → (∃x:carr S. a1 ∈ f (singleton S x) ∧ x ∈ a)); ]
+ [ change with (∀a1.(∃x:carr S. a1 ∈ f {(x):S} ∧ x ∈ a) → a1 ∈ f a);
+ | change with (∀a1.a1 ∈. f a → (∃x:carr S. a1 ∈ f {(x):S} ∧ x ∈ a)); ]
| split;
- [ change with (∀a1.(∀y. y ∈ f (singleton S a1) → y ∈ a) → a1 ∈ f* a);
- | change with (∀a1.a1 ∈ f* a → (∀y. y ∈ f (singleton S a1) → y ∈ a)); ]]
+ [ change with (∀a1.(∀y. y ∈ f {(a1):S} → y ∈ a) → a1 ∈ f* a);
+ | change with (∀a1.a1 ∈ f* a → (∀y. y ∈ f {(a1):S} → y ∈ a)); ]]
[ intros; apply ((. (or_prop2 ?? f (singleton ? a1) a)^-1) ? a1);
[ intros 2; apply (f1 a2); change in f2 with (a2 ∈ f⎻ (singleton ? a1));
lapply (. (or_prop3 ?? f (singleton ? a2) (singleton ? a1)));