1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 (**) (* reverse include *)
16 include "ground/lib/subset_ext_equivalence.ma".
17 include "delayed_updating/unwind/unwind2_path_eq.ma".
18 include "delayed_updating/unwind/unwind2_prototerm.ma".
20 (* TAILED UNWIND FOR PROTOTERM **********************************************)
22 (* Constructions with subset_equivalence ************************************)
24 lemma unwind2_term_eq_repl_sn (f1) (f2) (t):
25 f1 ≗ f2 → ▼[f1]t ⇔ ▼[f2]t.
26 /3 width=1 by subset_equivalence_ext_f1_exteq, unwind2_path_eq_repl/
29 lemma unwind2_term_eq_repl_dx (f) (t1) (t2):
30 t1 ⇔ t2 → ▼[f]t1 ⇔ ▼[f]t2.
31 /2 width=1 by subset_equivalence_ext_f1_bi/