X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fmatita%2Fcontribs%2FPREDICATIVE-TOPOLOGY%2Fcoa_defs.ma;h=c840fbdaf7cddc972b4f3cdade571c5b2aa84dd4;hb=5104e38ee747fd1052ce21f3f9f2ecc778d590ba;hp=4600b0ecc8707cc5c1f350fd4dd86b6b57212f16;hpb=f104e539b06bf5695f4d526d5217a581f5a9c5f5;p=helm.git

diff --git a/helm/matita/contribs/PREDICATIVE-TOPOLOGY/coa_defs.ma b/helm/matita/contribs/PREDICATIVE-TOPOLOGY/coa_defs.ma
index 4600b0ecc..c840fbdaf 100644
--- a/helm/matita/contribs/PREDICATIVE-TOPOLOGY/coa_defs.ma
+++ b/helm/matita/contribs/PREDICATIVE-TOPOLOGY/coa_defs.ma
@@ -21,10 +21,10 @@ include "domain_data.ma".
 *)
 
 record COA: Type \def {
-   coa: Class;                                   (* carrier *)
+   coa:> Class;                                  (* carrier *)
 	 le: coa \to coa \to Prop;                     (* inclusion *)
 	 ov: coa \to coa \to Prop;                     (* overlap *)
-	 sup: \forall (D:Domain). (D \to coa) \to coa; (* suprimum *)
+	 sup: \forall (D:Domain). (D \to coa) \to coa; (* supremum *)
 	 inf: \forall (D:Domain). (D \to coa) \to coa; (* infimum *)
 	 le_refl: \forall p. le p p;
 	 le_trans: \forall p,r. le p r \to \forall q. le r q \to le p q; 
@@ -36,8 +36,6 @@ record COA: Type \def {
 	 density: \forall p,q. (\forall r. ov p r \to ov q r) \to le p q
 }.
 
-coercion coa.
-
 definition zero: \forall (P:COA). P \def
    \lambda (P:COA). inf P ? (dvoid_ixfam P).
 
@@ -56,4 +54,8 @@ definition bsup: \forall (P:COA). P \to P \to P \def
    inf_ov: forall p q, ov p q -> ov p (inf QDBool (bool_family _ p q))
 	 properness: ov zero zero -> False;
 	 distributivity: forall I p q, id _ (inf QDBool (bool_family _ (sup I p) q)) (sup I (fun i => (inf QDBool (bool_family _ (p i) q))));
-*)
\ No newline at end of file
+*)
+
+inductive pippo : Prop \def
+   | Pippo: let x \def zero in zero = x \to pippo.
+   
\ No newline at end of file