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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 *)
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15 include "delayed_updating/substitution/lift_prototerm_id.ma".
16 include "delayed_updating/substitution/lift_path_uni.ma".
17 include "delayed_updating/syntax/prototerm_constructors_eq.ma".
19 (* LIFT FOR PROTOTERM *******************************************************)
21 lemma lift_term_iref_sn (f) (t:prototerm) (n:pnat):
22 (𝛕f@⧣❨n❩.↑[⇂*[n]f]t) ⊆ ↑[f](𝛕n.t).
23 #f #t #n #p * #q * #r #Hr #H1 #H2 destruct
24 @(ex2_intro … (𝗱n◗𝗺◗r))
25 /2 width=1 by in_comp_iref/
28 lemma lift_term_iref_dx (f) (t) (n:pnat):
29 ↑[f](𝛕n.t) ⊆ 𝛕f@⧣❨n❩.↑[⇂*[n]f]t.
30 #f #t #n #p * #q #Hq #H0 destruct
31 elim (in_comp_inv_iref … Hq) -Hq #p #H0 #Hp destruct
32 /3 width=1 by in_comp_iref, in_comp_lift_path_term/
35 lemma lift_term_iref (f) (t) (n:pnat):
36 (𝛕f@⧣❨n❩.↑[⇂*[n]f]t) ⇔ ↑[f](𝛕n.t).
37 /3 width=1 by conj, lift_term_iref_sn, lift_term_iref_dx/
40 lemma lift_term_iref_uni (t) (m) (n):
41 (𝛕(n+m).t) ⇔ ↑[𝐮❨m❩](𝛕n.t).
43 @(subset_eq_trans … (lift_term_iref …))
44 <tr_uni_pap >nsucc_pnpred <tr_tls_succ_uni
45 /3 width=1 by iref_eq_repl, lift_term_id/