update in basic_2

[helm.git] / matita / matita / contribs / lambdadelta / basic_1 / drop1 / defs.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_1/drop1/defs.ma b/matita/matita/contribs/lambdadelta/basic_1/drop1/defs.ma
index ff42adbf5a4a8c20703ce103aec613b9d3111123..41b084879aa85bc4687975ae5f502c35a76a7320 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_1/drop1/defs.ma
+++ b/matita/matita/contribs/lambdadelta/basic_1/drop1/defs.ma
@@ -24,7 +24,7 @@ inductive drop1: PList \to (C \to (C \to Prop)) \def
 nat).((drop h d c1 c2) \to (\forall (c3: C).(\forall (hds: PList).((drop1 hds 
 c2 c3) \to (drop1 (PCons h d hds) c1 c3)))))))).
 
-let rec ptrans (hds: PList) on hds: nat \to PList \def \lambda (i: 
+rec definition ptrans (hds: PList) on hds: nat \to PList \def \lambda (i: 
 nat).(match hds with [PNil \Rightarrow PNil | (PCons h d hds0) \Rightarrow 
 (let j \def (trans hds0 i) in (let q \def (ptrans hds0 i) in (match (blt j d) 
 with [true \Rightarrow (PCons h (minus d (S j)) q) | false \Rightarrow