partial commit in delayed_updating

[helm.git] / matita / matita / contribs / lambdadelta / delayed_updating / syntax / path_structure.ma

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_structure.ma b/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_structure.ma
index d7608ba18cc41268dff09f4f27c6e065829a8cbb..a9d9dd18f362a187272cd5b7474fd2e261a2296a 100644 (file)
--- a/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_structure.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/syntax/path_structure.ma
@@ -17,18 +17,85 @@ include "delayed_updating/notation/functions/circled_times_1.ma".
 
 (* STRUCTURE FOR PATH *******************************************************)
 
-rec definition path_structure (p) on p ≝
+rec definition structure (p) on p ≝
 match p with
 [ list_empty     ⇒ 𝐞
 | list_lcons l q ⇒
    match l with
-   [ label_node_d n ⇒ path_structure q
-   | label_edge_L   ⇒ 𝗟;path_structure q
-   | label_edge_A   ⇒ 𝗔;path_structure q
-   | label_edge_S   ⇒ 𝗦;path_structure q
+   [ label_d k ⇒ structure q
+   | label_m   ⇒ structure q
+   | label_L   ⇒ (structure q)◖𝗟
+   | label_A   ⇒ (structure q)◖𝗔
+   | label_S   ⇒ (structure q)◖𝗦
    ]
 ].
 
 interpretation
   "structure (path)"
-  'CircledTimes p = (path_structure p).
+  'CircledTimes p = (structure p).
+
+(* Basic constructions ******************************************************)
+
+lemma structure_empty:
+      𝐞 = ⊗𝐞.
+// qed.
+
+lemma structure_d_dx (p) (k):
+      ⊗p = ⊗(p◖𝗱k).
+// qed.
+
+lemma structure_m_dx (p):
+      ⊗p = ⊗(p◖𝗺).
+// qed.
+
+lemma structure_L_dx (p):
+      (⊗p)◖𝗟 = ⊗(p◖𝗟).
+// qed.
+
+lemma structure_A_dx (p):
+      (⊗p)◖𝗔 = ⊗(p◖𝗔).
+// qed.
+
+lemma structure_S_dx (p):
+      (⊗p)◖𝗦 = ⊗(p◖𝗦).
+// qed.
+
+(* Main constructions *******************************************************)
+
+theorem structure_idem (p):
+        ⊗p = ⊗⊗p.
+#p elim p -p [| * [ #k ] #p #IH ] //
+qed.
+
+theorem structure_append (p) (q):
+        ⊗p●⊗q = ⊗(p●q).
+#p #q elim q -q [| * [ #k ] #q #IH ]
+[||*: <list_append_lcons_sn ] //
+qed.
+
+(* Constructions with path_lcons ********************************************)
+
+lemma structure_d_sn (p) (k):
+      ⊗p = ⊗(𝗱k◗p).
+#p #n <structure_append //
+qed.
+
+lemma structure_m_sn (p):
+      ⊗p = ⊗(𝗺◗p).
+#p <structure_append //
+qed.
+
+lemma structure_L_sn (p):
+      (𝗟◗⊗p) = ⊗(𝗟◗p).
+#p <structure_append //
+qed.
+
+lemma structure_A_sn (p):
+      (𝗔◗⊗p) = ⊗(𝗔◗p).
+#p <structure_append //
+qed.
+
+lemma structure_S_sn (p):
+      (𝗦◗⊗p) = ⊗(𝗦◗p).
+#p <structure_append //
+qed.