update in basic_2

[helm.git] / matita / matita / contribs / lambdadelta / ground_1 / types / props.ma

diff --git a/matita/matita/contribs/lambdadelta/ground_1/types/props.ma b/matita/matita/contribs/lambdadelta/ground_1/types/props.ma
index 7eabcfdb5fa947f5baa5b69c7c17eef58cdc5f8d..79919dc763b16dc08dfd994f94168efed4f702c0 100644 (file)
--- a/matita/matita/contribs/lambdadelta/ground_1/types/props.ma
+++ b/matita/matita/contribs/lambdadelta/ground_1/types/props.ma
@@ -16,7 +16,7 @@
 
 include "ground_1/types/defs.ma".
 
-theorem ex2_sym:
+lemma ex2_sym:
  \forall (A: Type[0]).(\forall (P: ((A \to Prop))).(\forall (Q: ((A \to 
 Prop))).((ex2 A (\lambda (x: A).(P x)) (\lambda (x: A).(Q x))) \to (ex2 A 
 (\lambda (x: A).(Q x)) (\lambda (x: A).(P x))))))