update in delayed updating

[helm.git] / matita / matita / contribs / lambdadelta / delayed_updating / reduction / dfr.ma

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma
index 6890031062b55e008868119ea09cb6021a5f172e..3dca53142fb3a3e6fabc1d31a0fd34f1795831d1 100644 (file)
--- a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dfr.ma
@@ -22,8 +22,8 @@ include "delayed_updating/notation/relations/black_rightarrow_df_4.ma".
 
 inductive dfr (p) (q) (t): predicate preterm ≝
 | dfr_beta (b):
-  let r ≝ p●𝗔◗b●𝗟◗q◖𝗱❨↑❘q❘❩ in
-  r ϵ t → ⊓⊗b → dfr p q t (t[⋔r←t⋔(p◖𝗦)])
+  let r ≝ p●𝗔◗b●𝗟◗q◖𝗱(↑❘q❘) in
+  r ϵ t → ⊓(⊗b) → dfr p q t (t[⋔r←t⋔(p◖𝗦)])
 .
 
 interpretation