update in ground

[helm.git] / matita / matita / contribs / lambdadelta / ground / lib / stream_tls.ma

diff --git a/matita/matita/contribs/lambdadelta/ground/lib/stream_tls.ma b/matita/matita/contribs/lambdadelta/ground/lib/stream_tls.ma
index 185de605e6ac1b4ec96984630311e0ca8d226b70..f66c8a63fd451ce8940fcc5297d1951b7ecc9957 100644 (file)
--- a/matita/matita/contribs/lambdadelta/ground/lib/stream_tls.ma
+++ b/matita/matita/contribs/lambdadelta/ground/lib/stream_tls.ma
@@ -12,7 +12,7 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "ground/notation/functions/downspoonstar_3.ma".
+include "ground/notation/functions/downharpoonrightstar_3.ma".
 include "ground/lib/stream_hdtl.ma".
 include "ground/arith/nat_succ_iter.ma".
 
@@ -23,26 +23,36 @@ definition stream_tls (A) (n): stream A → stream A ≝
 
 interpretation
   "iterated tail (strams)"
-  'DownSpoonStar A n f = (stream_tls A n f).
+  'DownHarpoonRightStar A n f = (stream_tls A n f).
 
 (* Basic constructions ******************************************************)
 
 lemma stream_tls_zero (A) (t):
-      t = â«°*{A}[𝟎]t.
+      t = â\87\82*{A}[𝟎]t.
 // qed.
 
 lemma stream_tls_tl (A) (n) (t):
-      (â«°â«°*[n]t) = â«°*{A}[n]â«°t.
+      (â\87\82â\87\82*[n]t) = â\87\82*{A}[n]â\87\82t.
 #A #n #t
 @(niter_appl … (stream_tl …))
 qed.
 
 lemma stream_tls_succ (A) (n) (t):
-      (â«°â«°*[n]t) = â«°*{A}[↑n]t.
+      (â\87\82â\87\82*[n]t) = â\87\82*{A}[↑n]t.
 #A #n #t
 @(niter_succ … (stream_tl …))
 qed.
 
 lemma stream_tls_swap (A) (n) (t):
-      (⫰*[n]⫰t) = ⫰*{A}[↑n]t.
+      (⇂*[n]⇂t) = ⇂*{A}[↑n]t.
+// qed.
+
+(* Advanced constructions ***************************************************)
+
+lemma stream_tls_unit (A) (t):
+      ⇂t = ⇂*{A}[𝟏]t.
+// qed.
+
+lemma stream_tls_succ_lcons (A) (n) (a) (t):
+      ⇂*[n]t = ⇂*{A}[↑n](a⨮t).
 // qed.