X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fdelayed_updating%2Freduction%2Fifr.ma;h=b58f9ee185d40458dac3ea3baf30906a03cb1825;hb=13584a37bbcde10e03c8a488f5b93e1e042da0a6;hp=582f6ed5761ff450a54d34d6b113c5c07e9aaaa1;hpb=2cc4eb5d0210be58286e028278852122dcb68052;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
index 582f6ed57..b58f9ee18 100644
--- a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/ifr.ma
@@ -24,8 +24,8 @@ include "delayed_updating/notation/relations/black_rightarrow_f_4.ma".
 definition ifr (p) (q): relation2 prototerm prototerm ≝
            λt1,t2. ∃b.
            let r ≝ p●𝗔◗b●𝗟◗q in
-           ∧∧ ⊓(⊗b) & r◖𝗱(↑❘q❘) ϵ t1 &
-              t2 ⇔ t1[⋔r←↑[𝐮❨↑❘q❘❩]t1⋔(p◖𝗦)]
+           ∧∧ ⊗b ϵ 𝐁 & r◖𝗱❘q❘ ϵ t1 &
+              t1[⋔r←↑[𝐮❨❘q❘❩](t1⋔(p◖𝗦))] ⇔ t2
 .
 
 interpretation