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 *)
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15 include "delayed_updating/unwind/unwind2_prototerm_eq.ma".
16 include "delayed_updating/unwind/unwind2_path_after.ma".
18 (* TAILED UNWIND FOR PROTOTERM **********************************************)
20 (* Constructions with tr_after **********************************************)
22 lemma unwind2_term_after (f1) (f2) (t):
23 ▼[f2]▼[f1]t ⇔ ▼[f2∘f1]t.
24 #f1 #f2 #t @subset_eq_trans
26 | @subset_inclusion_ext_f1_compose
27 | @subset_equivalence_ext_f1_exteq /2 width=5/