X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fdelayed_updating%2Freduction%2Fdfr.ma;h=8e26b62b9c4f7219b31d0285583859c084cf5195;hp=27468022ad4c4e22109173830d80a04d6498f657;hb=d06053844638d88936d711b66fddbcca2a9add1c;hpb=9e31ac1f3f868349154b0ce2e550e2476aaf6a30

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma
index 27468022a..8e26b62b9 100644
--- a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma
@@ -24,7 +24,7 @@ include "ground/xoa/ex_4_3.ma".
 definition dfr (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←𝛕↑n.(t1⋔(p◖𝗦))] ⇔ t2
 .