(* *)
(**************************************************************************)
-include "delayed_updating/unwind/unwind2_prototerm.ma".
include "delayed_updating/substitution/fsubst.ma".
+include "delayed_updating/substitution/lift_prototerm.ma".
include "delayed_updating/syntax/prototerm_eq.ma".
include "delayed_updating/syntax/path_head.ma".
+include "delayed_updating/syntax/path_reverse.ma".
include "delayed_updating/notation/relations/black_rightarrow_if_4.ma".
(* IMMEDIATE FOCUSED REDUCTION ************************************************)
λt1,t2. ∃n:pnat.
let r ≝ p●𝗔◗𝗟◗q in
∧∧ (𝗟◗q)ᴿ = ↳[n](rᴿ) & r◖𝗱n ϵ t1 &
- t1[â\8b\94râ\86\90â\96¼[𝐮❨n❩](t1⋔(p◖𝗦))] ⇔ t2
+ t1[â\8b\94râ\86\90â\86\91[𝐮❨n❩](t1⋔(p◖𝗦))] ⇔ t2
.
interpretation