update in groud_2 and models

[helm.git] / helm / software / matita / nlibrary / logic / destruct_bb.ma

diff --git a/helm/software/matita/nlibrary/logic/destruct_bb.ma b/helm/software/matita/nlibrary/logic/destruct_bb.ma
index c64b651180076612c3c3fe27b6b699ac51c50018..308f8bebeb91ed3b554cca708bb4e6fbd0eb1124 100644 (file)
--- a/helm/software/matita/nlibrary/logic/destruct_bb.ma
+++ b/helm/software/matita/nlibrary/logic/destruct_bb.ma
@@ -14,6 +14,13 @@
 
 include "logic/equality.ma".
 
+ninductive unit: Type[0] ≝ k: unit.
+
+ninductive bool: unit → Type[0] ≝ true : bool k | false : bool k.
+
+nlemma foo: true = false → False. #H; ndestruct;
+nqed.
+
 (* nlemma prova : ∀T:Type[0].∀a,b:T.∀e:a = b.
                ∀P:∀x,y:T.x=y→Prop.P a a (refl T a) → P a b e.
 #T;#a;#b;#e;#P;#H;