lambda: some refactoring + support for subsets of subterms started

[helm.git] / matita / matita / contribs / lambda / labeled_sequential_computation.ma

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-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||M||                                                             *)
-(*      ||A||       A project by Andrea Asperti                           *)
-(*      ||T||                                                             *)
-(*      ||I||       Developers:                                           *)
-(*      ||T||         The HELM team.                                      *)
-(*      ||A||         http://helm.cs.unibo.it                             *)
-(*      \   /                                                             *)
-(*       \ /        This file is distributed under the terms of the       *)
-(*        v         GNU General Public License Version 2                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-include "pointer_list.ma".
-include "parallel_computation.ma".
-
-(* LABELED SEQUENTIAL COMPUTATION (MULTISTEP) *******************************)
-
-definition lsreds: ptrl → relation term ≝ lstar … lsred.
-
-interpretation "labelled sequential computation"
-   'SeqRedStar M s N = (lsreds s M N).
-
-notation "hvbox( M break ↦* [ term 46 s ] break term 46 N )"
-   non associative with precedence 45
-   for @{ 'SeqRedStar $M $s $N }.
-
-lemma lsreds_refl: reflexive … (lsreds (◊)).
-//
-qed.
-
-lemma lsreds_step_sn: ∀p,M1,M. M1 ↦[p] M → ∀s,M2. M ↦*[s] M2 → M1 ↦*[p::s] M2.
-/2 width=3/
-qed-.
-
-lemma lsreds_step_dx: ∀s,M1,M. M1 ↦*[s] M → ∀p,M2. M ↦[p] M2 → M1 ↦*[s@p::◊] M2.
-/2 width=3/
-qed-.
-
-lemma lsreds_step_rc: ∀p,M1,M2. M1 ↦[p] M2 → M1 ↦*[p::◊] M2.
-/2 width=1/
-qed.
-
-lemma lsreds_inv_nil: ∀s,M1,M2. M1 ↦*[s] M2 → ◊ = s → M1 = M2.
-/2 width=5 by lstar_inv_nil/
-qed-.
-
-lemma lsreds_inv_cons: ∀s,M1,M2. M1 ↦*[s] M2 → ∀q,r. q::r = s →
-                       ∃∃M. M1 ↦[q] M & M ↦*[r] M2.
-/2 width=3 by lstar_inv_cons/
-qed-.
-
-lemma lsreds_inv_step_rc: ∀p,M1,M2. M1 ↦*[p::◊] M2 → M1 ↦[p] M2.
-/2 width=1 by lstar_inv_step/
-qed-.
-
-lemma lsreds_inv_pos: ∀s,M1,M2. M1 ↦*[s] M2 → 0 < |s| →
-                      ∃∃p,r,M. p::r = s & M1 ↦[p] M & M ↦*[r] M2.
-/2 width=1 by lstar_inv_pos/
-qed-.
-
-lemma lsred_compatible_rc: ho_compatible_rc lsreds.
-/3 width=1/
-qed.
-
-lemma lsreds_compatible_sn: ho_compatible_sn lsreds.
-/3 width=1/
-qed.
-
-lemma lsreds_compatible_dx: ho_compatible_dx lsreds.
-/3 width=1/
-qed.
-
-lemma lsreds_lift: ∀s. liftable (lsreds s).
-/2 width=1/
-qed.
-
-lemma lsreds_inv_lift: ∀s. deliftable_sn (lsreds s).
-/3 width=3 by lstar_deliftable_sn, lsred_inv_lift/
-qed-.
-
-lemma lsreds_dsubst: ∀s. dsubstable_dx (lsreds s).
-/2 width=1/
-qed.
-
-theorem lsreds_mono: ∀s. singlevalued … (lsreds s).
-/3 width=7 by lstar_singlevalued, lsred_mono/
-qed-.
-
-theorem lsreds_trans: ltransitive … lsreds.
-/2 width=3 by lstar_ltransitive/
-qed-.
-
-lemma lsreds_compatible_appl: ∀r,B1,B2. B1 ↦*[r] B2 → ∀s,A1,A2. A1 ↦*[s] A2 →
-                              @B1.A1 ↦*[(sn:::r)@dx:::s] @B2.A2.
-#r #B1 #B2 #HB12 #s #A1 #A2 #HA12
-@(lsreds_trans … (@B2.A1)) /2 width=1/
-qed.
-
-lemma lsreds_compatible_beta: ∀r,B1,B2. B1 ↦*[r] B2 → ∀s,A1,A2. A1 ↦*[s] A2 →
-                              @B1.𝛌.A1 ↦*[(sn:::r)@(dx:::rc:::s)@◊::◊] [↙B2] A2.
-#r #B1 #B2 #HB12 #s #A1 #A2 #HA12
-@(lsreds_trans … (@B2.𝛌.A1)) /2 width=1/ -r -B1
-@(lsreds_step_dx … (@B2.𝛌.A2)) // /3 width=1/
-qed.
-
-(* Note: "|s|" should be unparetesized *)
-lemma lsreds_fwd_mult: ∀s,M1,M2. M1 ↦*[s] M2 → #{M2} ≤ #{M1} ^ (2 ^ (|s|)).
-#s #M1 #M2 #H @(lstar_ind_l ????????? H) -s -M1 normalize //
-#p #s #M1 #M #HM1 #_ #IHM2
-lapply (lsred_fwd_mult … HM1) -p #HM1
-@(transitive_le … IHM2) -M2
-/3 width=1 by le_exp1, lt_O_exp, lt_to_le/ (**) (* auto: slow without trace *)
-qed-.
-
-theorem lsreds_preds: ∀s,M1,M2. M1 ↦*[s] M2 → M1 ⤇* M2.
-#s #M1 #M2 #H @(lstar_ind_l ????????? H) -s -M1 //
-#a #s #M1 #M #HM1 #_ #IHM2
-@(preds_step_sn … IHM2) -M2 /2 width=2/
-qed.
-
-lemma pred_lsreds: ∀M1,M2. M1 ⤇ M2 → ∃r. M1 ↦*[r] M2.
-#M1 #M2 #H elim H -M1 -M2 /2 width=2/
-[ #A1 #A2 #_ * /3 width=2/
-| #B1 #B2 #A1 #A2 #_ #_ * #r #HB12 * /3 width=2/
-| #B1 #B2 #A1 #A2 #_ #_ * #r #HB12 * /3 width=2/
-qed-.
-
-theorem preds_lsreds: ∀M1,M2. M1 ⤇* M2 → ∃r. M1 ↦*[r] M2.
-#M1 #M2 #H elim H -M2 /2 width=2/
-#M #M2 #_ #HM2 * #r #HM1
-elim (pred_lsreds … HM2) -HM2 #s #HM2
-lapply (lsreds_trans … HM1 … HM2) -M /2 width=2/
-qed-.
-
-theorem lsreds_conf: ∀s1,M0,M1. M0 ↦*[s1] M1 → ∀s2,M2. M0 ↦*[s2] M2 →
-                     ∃∃r1,r2,M. M1 ↦*[r1] M & M2 ↦*[r2] M.
-#s1 #M0 #M1 #HM01 #s2 #M2 #HM02
-lapply (lsreds_preds … HM01) -s1 #HM01
-lapply (lsreds_preds … HM02) -s2 #HM02
-elim (preds_conf … HM01 … HM02) -M0 #M #HM1 #HM2
-elim (preds_lsreds … HM1) -HM1
-elim (preds_lsreds … HM2) -HM2 /2 width=5/
-qed-.