minor corrections and updates

[helm.git] / matita / matita / contribs / lambdadelta / ground_2 / lib / streams_hdtl.ma

diff --git a/matita/matita/contribs/lambdadelta/ground_2/lib/streams_hdtl.ma b/matita/matita/contribs/lambdadelta/ground_2/lib/streams_hdtl.ma
deleted file mode 100644 (file)
index f128e5f..0000000
--- a/matita/matita/contribs/lambdadelta/ground_2/lib/streams_hdtl.ma
+++ /dev/null
@@ -1,39 +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 "ground_2/notation/functions/downspoon_2.ma".
-include "ground_2/lib/streams_eq.ma".
-include "ground_2/lib/arith.ma".
-
-(* STREAMS ******************************************************************)
-
-definition hd (A:Type[0]): stream A → A ≝
-              λt. match t with [ seq a _ ⇒ a ].
-
-definition tl (A:Type[0]): stream A → stream A ≝
-              λt. match t with [ seq _ t ⇒ t ].
-
-interpretation "tail (streams)" 'DownSpoon A t = (tl A t).
-
-(* basic properties *********************************************************)
-
-lemma hd_rew (A) (a) (t): a = hd A (a⨮t).
-// qed.
-
-lemma tl_rew (A) (a) (t): t = tl A (a⨮t).
-// qed.
-
-lemma eq_stream_split (A) (t): (hd … t) ⨮ ⫰t ≗{A} t.
-#A * //
-qed.