X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Flibrary%2Fdatatypes%2Fconstructors.ma;h=92b27d64e904d543b696040a750419a701a29997;hb=8bc5bc0e8375a85736f6a5df317d129d5efa8de4;hp=3f74db5ad85cfb8b7e9ce99d414471fe53f88f3b;hpb=68a2f8d0a8c34cb7ea0438c7db9222a853a38826;p=helm.git

diff --git a/helm/software/matita/library/datatypes/constructors.ma b/helm/software/matita/library/datatypes/constructors.ma
index 3f74db5ad..92b27d64e 100644
--- a/helm/software/matita/library/datatypes/constructors.ma
+++ b/helm/software/matita/library/datatypes/constructors.ma
@@ -12,38 +12,45 @@
 (*                                                                        *)
 (**************************************************************************)
 
-set "baseuri" "cic:/matita/datatypes/constructors/".
 include "logic/equality.ma".
 
 inductive void : Set \def.
 
-inductive Prod (A,B:Set) : Set \def
+inductive unit : Set ≝ something: unit.
+
+inductive Prod (A,B:Type) : Type \def
 pair : A \to B \to Prod A B.
 
-definition fst \def \lambda A,B:Set.\lambda p: Prod A B.
+interpretation "Pair construction" 'pair x y = (pair ? ? x y).
+
+interpretation "Product" 'product x y = (Prod x y).
+
+definition fst \def \lambda A,B:Type.\lambda p: Prod A B.
 match p with
 [(pair a b) \Rightarrow a]. 
 
-definition snd \def \lambda A,B:Set.\lambda p: Prod A B.
+definition snd \def \lambda A,B:Type.\lambda p: Prod A B.
 match p with
 [(pair a b) \Rightarrow b].
 
-theorem eq_pair_fst_snd: \forall A,B:Set.\forall p: Prod A B.
-p = pair A B (fst A B p) (snd A B p).
+interpretation "pair pi1" 'pi1 = (fst ? ?).
+interpretation "pair pi2" 'pi2 = (snd ? ?).
+interpretation "pair pi1" 'pi1a x = (fst ? ? x).
+interpretation "pair pi2" 'pi2a x = (snd ? ? x).
+interpretation "pair pi1" 'pi1b x y = (fst ? ? x y).
+interpretation "pair pi2" 'pi2b x y = (snd ? ? x y).
+
+theorem eq_pair_fst_snd: \forall A,B:Type.\forall p:Prod A B.
+p = 〈 \fst p, \snd p 〉.
 intros.elim p.simplify.reflexivity.
 qed.
 
-inductive Sum (A,B:Set) : Set \def
+inductive Sum (A,B:Type) : Type \def
   inl : A \to Sum A B
 | inr : B \to Sum A B.
 
-inductive ProdT (A,B:Type) : Type \def
-pairT : A \to B \to ProdT A B.
+interpretation "Disjoint union" 'plus A B = (Sum A B).
 
-definition fstT \def \lambda A,B:Type.\lambda p: ProdT A B.
-match p with
-[(pairT a b) \Rightarrow a]. 
-
-definition sndT \def \lambda A,B:Type.\lambda p: ProdT A B.
-match p with
-[(pairT a b) \Rightarrow b].
\ No newline at end of file
+inductive option (A:Type) : Type ≝
+   None : option A
+ | Some : A → option A.