From cf2a049a6cc888f6c5d0637ab0523f186058fc8f Mon Sep 17 00:00:00 2001
From: Ferruccio Guidi <ferruccio.guidi@unibo.it>
Date: Tue, 27 Dec 2022 17:08:00 +0100
Subject: [PATCH] update in delayed_updating

+ more complex example in which discarding num labels in b solves unwind
---
 .../reduction/dbfr_unprotected_neg.ma         | 145 ++++++++++++++++++
 .../reduction/dbfr_unprotected_zero.ma        | 125 ---------------
 2 files changed, 145 insertions(+), 125 deletions(-)
 create mode 100644 matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_neg.ma
 delete mode 100644 matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_zero.ma

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_neg.ma b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_neg.ma
new file mode 100644
index 000000000..a83a71d5f
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_neg.ma
@@ -0,0 +1,145 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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 "delayed_updating/reduction/dbfr_constructors.ma".
+include "delayed_updating/reduction/ibfr_constructors.ma".
+include "delayed_updating/unwind/unwind2_prototerm_constructors.ma".
+include "delayed_updating/substitution/lift_prototerm_constructors.ma".
+include "ground/arith/pnat_two.ma".
+
+(* DELAYED BALANCED FOCUSED REDUCTION ***************************************)
+
+(* Example of unprotected balanced β-reduction ******************************)
+
+definition un_t: prototerm ≝
+           ＠(𝛌.⧣𝟏).𝛌.𝛌.＠(⧣𝟐).𝛌.＠(⧣𝟐).⧣𝟏.
+
+definition un_i1: prototerm ≝
+           ＠(𝛌.⧣𝟏).𝛌.𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).⧣𝟏.
+
+lemma un_ti1:
+      un_t ➡𝐢𝐛𝐟[𝗔◗𝗟◗𝗟◗𝗦◗𝐞] un_i1.
+@(ibfr_eq_trans … (ibfr_beta_0 …))
+[ >list_append_lcons_sn
+  /3 width=1 by in_comp_appl_sd, in_comp_abst_hd/
+| /3 width=3 by pcc_S_sn, pcc_L_sn/
+| skip
+]
+@appl_eq_repl [ // ] @abst_eq_repl
+@(subset_eq_canc_sn … (fsubst_abst_hd …)) @abst_eq_repl
+@(subset_eq_canc_sn … (fsubst_appl_sd …)) @appl_eq_repl [| // ]
+@(subset_eq_canc_sn … (fsubst_empty_rc …))
+@(subset_eq_canc_sn … (lift_term_abst …)) @abst_eq_repl
+@(subset_eq_canc_sn … (lift_term_oref_pap … )) //
+qed.
+
+definition un_i2: prototerm ≝
+           ＠(𝛌.⧣𝟏).𝛌.𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛌.⧣𝟏.
+
+lemma un_i12:
+      un_i1 ➡𝐢𝐛𝐟[𝗔◗𝗟◗𝗟◗𝗔◗𝗟◗𝗔◗𝐞] un_i2.
+@ibfr_appl_hd
+@ibfr_abst_hd
+@ibfr_abst_hd
+@(ibfr_eq_trans … (ibfr_beta_0 …))
+[ >list_append_lcons_sn
+  /2 width=1 by in_comp_appl_hd/
+| /2 width=1 by pcc_A_sn, pcc_empty/
+| skip
+]
+@appl_eq_repl [ // ] @abst_eq_repl
+@(subset_eq_canc_sn … (fsubst_appl_hd …)) @appl_eq_repl [ // ]
+@(subset_eq_canc_sn … (fsubst_empty_rc …))
+@(subset_eq_canc_sn … (lift_term_abst …)) @abst_eq_repl
+@(subset_eq_canc_sn … (lift_term_oref_pap … )) //
+qed.
+
+definition un_i3: prototerm ≝
+           ＠(𝛌.⧣𝟏).𝛌.𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛌.⧣↑𝟐.
+
+lemma un_i23:
+      un_i2 ➡𝐢𝐛𝐟[𝗔◗𝗟◗𝗟◗𝗔◗𝗟◗𝗔◗𝗟◗𝐞] un_i3.
+@ibfr_appl_hd
+@ibfr_abst_hd
+@ibfr_abst_hd
+@ibfr_appl_hd
+@ibfr_abst_hd
+@(ibfr_eq_trans … (ibfr_beta_0 …))
+[ // | // | skip ]
+@appl_eq_repl [ // ] @abst_eq_repl
+@(subset_eq_canc_sn … (fsubst_empty_rc …))
+@(subset_eq_canc_sn … (lift_term_oref_pap … )) //
+qed.
+
+definition un_d1: prototerm ≝
+           ＠(𝛌.⧣𝟏).𝛌.𝛌.＠(𝛕𝟐.𝛌.⧣𝟏).𝛌.＠(⧣𝟐).⧣𝟏.
+
+lemma un_td1:
+      un_t ➡𝐝𝐛𝐟[𝗔◗𝗟◗𝗟◗𝗦◗𝐞] un_d1.
+@(dbfr_eq_trans … (dbfr_beta_0 …))
+[ >list_append_lcons_sn
+  /3 width=1 by in_comp_appl_sd, in_comp_abst_hd/
+| /3 width=3 by pcc_S_sn, pcc_L_sn/
+| skip
+]
+@appl_eq_repl [ // ] @abst_eq_repl
+@(subset_eq_canc_sn … (fsubst_abst_hd …)) @abst_eq_repl
+@(subset_eq_canc_sn … (fsubst_appl_sd …)) @appl_eq_repl [| // ]
+@(subset_eq_canc_sn … (fsubst_empty_rc …))
+@iref_eq_repl //
+qed.
+
+definition un_d2: prototerm ≝
+           ＠(𝛌.⧣𝟏).𝛌.𝛌.＠(𝛕𝟐.𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛕𝟏.𝛕𝟐.𝛌.⧣𝟏.
+
+lemma un_d12:
+      un_d1 ➡𝐝𝐛𝐟[𝗔◗𝗟◗𝗟◗𝗔◗𝗟◗𝗔◗𝐞] un_d2.
+@dbfr_appl_hd
+@dbfr_abst_hd
+@dbfr_abst_hd
+@(dbfr_eq_trans … (dbfr_beta_0 …))
+[ >list_append_lcons_sn /2 width=1 by in_comp_appl_hd/
+| /2 width=1 by pcc_A_sn/
+| skip
+]
+@appl_eq_repl [ // ] @abst_eq_repl
+@(subset_eq_canc_sn … (fsubst_appl_hd …)) @appl_eq_repl [ // ]
+@(subset_eq_canc_sn … (fsubst_empty_rc …))
+@iref_eq_repl @iref_eq_repl //
+qed.
+
+definition un_d3: prototerm ≝
+           ＠(𝛌.⧣𝟏).𝛌.𝛌.＠(𝛕𝟐.𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛌.𝛕𝟏.⧣𝟐.
+
+lemma un_di3:
+      un_i3 ⇔ ▼[𝐢] un_d3.
+@(subset_eq_canc_sn … (unwind2_term_appl …)) @appl_eq_repl
+[ @(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
+  @(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
+]
+@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
+@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
+@(subset_eq_canc_sn … (unwind2_term_appl …)) @appl_eq_repl
+[ @(subset_eq_canc_sn … (unwind2_term_iref …))
+  @(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
+  @(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
+]
+@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
+@(subset_eq_canc_sn … (unwind2_term_appl …)) @appl_eq_repl
+[ @(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
+]
+@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
+@(subset_eq_canc_sn … (unwind2_term_iref …))
+@(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
+qed.
diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_zero.ma b/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_zero.ma
deleted file mode 100644
index 5b3631f9c..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/reduction/dbfr_unprotected_zero.ma
+++ /dev/null
@@ -1,125 +0,0 @@
-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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 "delayed_updating/reduction/dbfr_constructors.ma".
-include "delayed_updating/reduction/ibfr_constructors.ma".
-include "delayed_updating/unwind/unwind2_prototerm_constructors.ma".
-include "delayed_updating/substitution/lift_prototerm_constructors.ma".
-include "ground/arith/pnat_two.ma".
-
-(* DELAYED BALANCED FOCUSED REDUCTION ***************************************)
-
-(* Example of unprotected balanced β-reduction ******************************)
-
-definition l3_t: prototerm ≝
-           (𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).⧣𝟏).
-
-definition l3_i1: prototerm ≝
-           (𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛌.⧣𝟏).
-
-definition l3_i2: prototerm ≝
-           (𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛌.⧣↑𝟐).
-
-definition l3_i2': prototerm ≝
-           (𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛌.⧣↑↑𝟐).
-
-definition l3_d1: prototerm ≝
-           (𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛕𝟏.(𝛌.⧣𝟏)).
-
-definition l3_d2: prototerm ≝
-           (𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛕𝟏.𝛌.(⧣𝟐)).
-
-definition l3_d2': prototerm ≝
-           (𝛌.＠(𝛌.⧣𝟏).𝛌.＠(⧣𝟐).𝛕𝟏.𝛌.𝛕𝟏.(⧣𝟐)).
-
-lemma l3_ti1:
-      l3_t ➡𝐢𝐛𝐟[𝗟◗𝗔◗𝗟◗𝗔◗𝐞] l3_i1.
-@ibfr_abst_hd
-@ibfr_eq_trans
-[ | @(ibfr_beta_0 … (𝟎))
-  [ /2 width=1 by pcc_A_sn, pcc_empty/
-  | >list_append_lcons_sn /2 width=1 by in_comp_appl_hd/
-  ]
-]
-@appl_eq_repl [ // ]
-@abst_eq_repl
-@(subset_eq_canc_sn … (fsubst_appl_hd …))
-@appl_eq_repl [ // ]
-@(subset_eq_canc_sn … (fsubst_empty_rc …))
-@(subset_eq_canc_sn … (lift_term_abst …))
-@abst_eq_repl
-@(subset_eq_canc_sn … (lift_term_oref_pap … )) //
-qed.
-
-lemma l3_i12:
-      l3_i1 ➡𝐢𝐛𝐟[𝗟◗𝗔◗𝗟◗𝗔◗𝗟◗𝐞] l3_i2.
-@ibfr_abst_hd
-@ibfr_appl_hd
-@ibfr_abst_hd
-@ibfr_eq_trans [| @ibfr_beta_0 // ]
-@appl_eq_repl [ // ]
-@abst_eq_repl
-@(subset_eq_canc_sn … (fsubst_empty_rc …))
-@(subset_eq_canc_sn … (lift_term_oref_pap … )) //
-qed.
-
-lemma l3_td1:
-      l3_t ➡𝐝𝐛𝐟[𝗟◗𝗔◗𝗟◗𝗔◗𝐞] l3_d1.
-@dbfr_abst_hd
-@dbfr_eq_trans
-[ | @(dbfr_beta_0 … (𝟎))
-  [ /2 width=1 by pcc_A_sn, pcc_empty/
-  | >list_append_lcons_sn /2 width=1 by in_comp_appl_hd/
-  ]
-]
-@appl_eq_repl [ // ]
-@abst_eq_repl
-@(subset_eq_canc_sn … (fsubst_appl_hd …))
-@appl_eq_repl [ // ]
-@(subset_eq_canc_sn … (fsubst_empty_rc …))
-@iref_eq_repl //
-qed.
-
-lemma l3_di2:
-      l3_i2 ⇔ ▼[𝐢]l3_d2.
-@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-@(subset_eq_canc_sn … (unwind2_term_appl …)) @appl_eq_repl
-[ @(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-  @(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
-]
-@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-@(subset_eq_canc_sn … (unwind2_term_appl …)) @appl_eq_repl
-[ @(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
-]
-@(subset_eq_canc_sn … (unwind2_term_iref …))
-@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-@(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
-qed.
-
-lemma l3_di2':
-      l3_i2' ⇔ ▼[𝐢]l3_d2'.
-@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-@(subset_eq_canc_sn … (unwind2_term_appl …)) @appl_eq_repl
-[ @(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-  @(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
-]
-@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-@(subset_eq_canc_sn … (unwind2_term_appl …)) @appl_eq_repl
-[ @(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
-]
-@(subset_eq_canc_sn … (unwind2_term_iref …))
-@(subset_eq_canc_sn … (unwind2_term_abst …)) @abst_eq_repl
-@(subset_eq_canc_sn … (unwind2_term_iref …))
-@(subset_eq_canc_sn … (unwind2_term_oref_pap …)) //
-qed.
-- 
2.39.2