first version of kernel "basic_rg"

[helm.git] / helm / software / lambda-delta / lib / share.ml

diff --git a/helm/software/lambda-delta/lib/share.ml b/helm/software/lambda-delta/lib/share.ml
new file mode 100644 (file)
index 0000000..019cca9
--- /dev/null
+++ b/helm/software/lambda-delta/lib/share.ml
@@ -0,0 +1,16 @@
+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.              
+     \ /   This software is distributed as is, NO WARRANTY.              
+      V_______________________________________________________________ *)
+
+let sh a b =
+   if a == b then a else b
+   
+let sh2 a1 b1 a2 b2 c1 c2 =
+   if a1 == a2 && b1 == b2 then c1 else c2 (sh a1 a2) (sh b1 b2)