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14
15 include "formal_topology/basic_topologies.ma".
16 include "formal_topology/o-basic_topologies.ma".
17 include "formal_topology/relations_to_o-algebra.ma".
18
19 definition o_basic_topology_of_basic_topology: basic_topology → Obasic_topology.
20  intros (b); constructor 1;
21   [ apply (POW' b) | apply (A b) | apply (J b);
22   | apply (A_is_saturation b) | apply (J_is_reduction b) | apply (compatibility b) ]
23 qed.
24
25 definition o_continuous_relation_of_continuous_relation:
26  ∀BT1,BT2.continuous_relation BT1 BT2 →
27   Ocontinuous_relation (o_basic_topology_of_basic_topology BT1) (o_basic_topology_of_basic_topology BT2).
28  intros (BT1 BT2 c); constructor 1;
29   [ apply (orelation_of_relation ?? c) | apply (reduced ?? c) | apply (saturated ?? c) ]
30 qed.
31
32 axiom daemon: False.
33
34 lemma o_continuous_relation_of_continuous_relation_morphism :
35   ∀S,T:category2_of_category1 BTop.
36   unary_morphism2 (arrows2 (category2_of_category1 BTop) S T)
37    (arrows2 OBTop (o_basic_topology_of_basic_topology S) (o_basic_topology_of_basic_topology T)).
38 intros (S T);
39    constructor 1;
40      [ apply (o_continuous_relation_of_continuous_relation S T);
41      | cases daemon (*apply (o_relation_pair_of_relation_pair_is_morphism S T)*)]
42 qed.
43
44 definition BTop_to_OBTop: carr3 ((category2_of_category1 BTop) ⇒_\c3 OBTop).
45  constructor 1;
46   [ apply o_basic_topology_of_basic_topology;
47   | intros; apply o_continuous_relation_of_continuous_relation_morphism;
48   | cases daemon (*apply o_relation_topology_of_relation_topology_morphism_respects_id*);
49   | cases daemon (*apply o_relation_topology_of_relation_topology_morphism_respects_comp*);]
50 qed.
51
52 (*
53 alias symbol "eq" (instance 2) = "setoid1 eq".
54 alias symbol "eq" (instance 1) = "setoid2 eq".
55 theorem BTop_to_OBTop_faithful:
56  ∀S,T.∀f,g:arrows2 (category2_of_category1 BTop) S T.
57   map_arrows2 ?? BTop_to_OBTop ?? f = map_arrows2 ?? BTop_to_OBTop ?? g → f=g.
58  intros; change with (∀b.A ? (ext ?? f b) = A ? (ext ?? g b));
59  apply (POW_faithful);
60  apply (.= respects_comp2 ?? POW (concr S) (concr T) (form T) f \sub \c (⊩ \sub T));
61  apply sym2;
62  apply (.= respects_comp2 ?? POW (concr S) (concr T) (form T) g \sub \c (⊩ \sub T));
63  apply sym2;
64  apply e;
65 qed.
66
67 include "formal_topology/notation.ma".
68
69 theorem BTop_to_OBTop_full: 
70    ∀S,T.∀f. exT22 ? (λg. map_arrows2 ?? BTop_to_OBTop S T g = f).
71  intros;
72  cases (POW_full (carrbt S) (carrbt T) (Ocont_rel ?? f)) (g Hg);
73  exists[
74    constructor 1;
75     [ apply g
76     | apply hide; intros; lapply (Oreduced ?? f ? e);
77       cases Hg; lapply (e3 U) as K; apply (.= K);
78       apply (.= Hletin); apply rule (†(K^-1));
79     | apply hide; intros; lapply (Osaturated ?? f ? e);
80       cases Hg; lapply (e1 U) as K; apply (.= K);
81       apply (.= Hletin); apply rule (†(K^-1));
82     ]
83  | simplify; unfold BTop_to_OBTop; simplify;
84    unfold o_continuous_relation_of_continuous_relation_morphism; simplify;
85    cases Hg; whd; simplify; intro; 
86 qed.
87 *)