commit by user andrea

[helm.git] / weblib / basics / types.ma

diff --git a/weblib/basics/types.ma b/weblib/basics/types.ma
index 494177cfc11058555764c44e6a9a619e3fe0e27d..a07cf29ea0e9c23f862e5ce04b311a2db7a99b3b 100644 (file)
--- a/weblib/basics/types.ma
+++ b/weblib/basics/types.ma
@@ -39,7 +39,7 @@ interpretation "pair pi1" 'pi1b x y = (fst ? ? x y).
 interpretation "pair pi2" 'pi2b x y = (snd ? ? x y).
 
 theorem eq_pair_fst_snd: ∀A,B.∀p:A \ 5a title="Product" href="cic:/fakeuri.def(1)"\ 6×\ 5/a\ 6 B.
-  p \ 5a title="leibnitz's equality" href="cic:/fakeuri.def(1)"\ 6=\ 5/a\ 6 \ 5a title="Pair construction" href="cic:/fakeuri.def(1)"\ 6〈\ 5/a\ 6 \ 5a title="pair pi1" href="cic:/fakeuri.def(1)"\ 6\fst\ 5/a\ 6 p, \ 5a title="pair pi2" href="cic:/fakeuri.def(1)"\ 6\snd\ 5/a\ 6 p 〉.
+  p \ 5a title="leibnitz's equality" href="cic:/fakeuri.def(1)"\ 6=\ 5/a\ 6 \ 5a title="Pair construction" href="cic:/fakeuri.def(1)"\ 6〈\ 5/a\ 6 \ 5a title="pair pi1" href="cic:/fakeuri.def(1)"\ 6\fst\ 5/a\ 6 p, \ 5a title="pair pi2" href="cic:/fakeuri.def(1)"\ 6\snd\ 5/a\ 6 p 〉.
 #A #B #p (cases p) // qed.
 
 (* sum *)
@@ -56,4 +56,6 @@ inductive option (A:Type[0]) : Type[0] ≝
 
 (* sigma *)
 inductive Sig (A:Type[0]) (f:A→Type[0]) : Type[0] ≝
-  dp: ∀a:A.(f a)→Sig A f.
\ No newline at end of file
+  dp: ∀a:A.(f a)→Sig A f.
+
+interpretation "Sigma" 'sigma x = (Sig ? x).
\ No newline at end of file