X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fdelayed_updating%2Freduction%2Fifr.ma;h=9bc8d994dcb6a934baed8787f52173136b314eff;hp=92512b342ed50449745aa0fdec371d10bad5621e;hb=d06053844638d88936d711b66fddbcca2a9add1c;hpb=9e31ac1f3f868349154b0ce2e550e2476aaf6a30

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
index 92512b342..9bc8d994d 100644
--- a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
@@ -25,7 +25,7 @@ include "ground/xoa/ex_4_3.ma".
 definition ifr (r): relation2 prototerm prototerm ≝
            λt1,t2.
            ∃∃p,q,n. p●𝗔◗𝗟◗q = r &
-           q ϵ 𝐂❨n❩ & r◖𝗱↑n ϵ t1 &
+           q ϵ 𝐂❨Ⓕ,n❩ & r◖𝗱↑n ϵ t1 &
            t1[⋔r←↑[𝐮❨↑n❩](t1⋔(p◖𝗦))] ⇔ t2
 .