matita/matita/contribs/lambdadelta/basic_2/relocation/lifts_tdeq.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
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  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU General Public License Version 2                  *)
  12 (*                                                                        *)
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  14
  15 include "basic_2/syntax/tdeq.ma".
  16 include "basic_2/relocation/lifts.ma".
  17
  18 (* GENERIC RELOCATION FOR TERMS *********************************************)
  19
  20 (* Properties with degree-based equivalence for terms ***********************)
  21
  22 lemma tdeq_lifts: ∀h,o. liftable2 (tdeq h o).
  23 #h #o #T1 #T2 #H elim H -T1 -T2 [||| * ]
  24 [ #s1 #s2 #d #Hs1 #Hs2 #f #X #H >(lifts_inv_sort1 … H) -H
  25   /3 width=5 by lifts_sort, tdeq_sort, ex2_intro/
  26 | #i #f #X #H elim (lifts_inv_lref1 … H) -H
  27   /3 width=3 by lifts_lref, tdeq_lref, ex2_intro/
  28 | #l #f #X #H >(lifts_inv_gref1 … H) -H
  29   /2 width=3 by lifts_gref, tdeq_gref, ex2_intro/
  30 | #p #I #V1 #V2 #T1 #T2 #_ #_ #IHV #IHT #f #X #H elim (lifts_inv_bind1 … H) -H
  31   #W1 #U1 #HVW1 #HTU1 #H destruct
  32   elim (IHV … HVW1) -V1 elim (IHT … HTU1) -T1
  33   /3 width=5 by lifts_bind, tdeq_pair, ex2_intro/
  34 | #I #V1 #V2 #T1 #T2 #_ #_ #IHV #IHT #f #X #H elim (lifts_inv_flat1 … H) -H
  35   #W1 #U1 #HVW1 #HTU1 #H destruct
  36   elim (IHV … HVW1) -V1 elim (IHT … HTU1) -T1
  37   /3 width=5 by lifts_flat, tdeq_pair, ex2_intro/
  38 ]
  39 qed-.
  40
  41 (* Inversion lemmas with degree-based equivalence for terms *****************)
  42
  43 lemma tdeq_inv_lifts: ∀h,o. deliftable2_sn (tdeq h o).
  44 #h #o #U1 #U2 #H elim H -U1 -U2 [||| * ]
  45 [ #s1 #s2 #d #Hs1 #Hs2 #f #X #H >(lifts_inv_sort2 … H) -H
  46   /3 width=5 by lifts_sort, tdeq_sort, ex2_intro/
  47 | #i #f #X #H elim (lifts_inv_lref2 … H) -H
  48   /3 width=3 by lifts_lref, tdeq_lref, ex2_intro/
  49 | #l #f #X #H >(lifts_inv_gref2 … H) -H
  50   /2 width=3 by lifts_gref, tdeq_gref, ex2_intro/
  51 | #p #I #W1 #W2 #U1 #U2 #_ #_ #IHW #IHU #f #X #H elim (lifts_inv_bind2 … H) -H
  52   #V1 #T1 #HVW1 #HTU1 #H destruct
  53   elim (IHW … HVW1) -W1 elim (IHU … HTU1) -U1
  54   /3 width=5 by lifts_bind, tdeq_pair, ex2_intro/
  55 | #I #W1 #W2 #U1 #U2 #_ #_ #IHW #IHU #f #X #H elim (lifts_inv_flat2 … H) -H
  56   #V1 #T1 #HVW1 #HTU1 #H destruct
  57   elim (IHW … HVW1) -W1 elim (IHU … HTU1) -U1
  58   /3 width=5 by lifts_flat, tdeq_pair, ex2_intro/
  59 ]
  60 qed-.