X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fcomponents%2Fbinaries%2Fmatex%2Fground.ml;h=7eebedb7d13e8fa810c4dc0eb867aa038362e474;hb=c992745a40b4ac8b6c5285bf9c5eff26c423f236;hp=91d85bc36443e1ac1d296abb486762cf14c69ca5;hpb=e9caa75be87bdbd68d8ca2d7291f623bec6b93aa;p=helm.git

diff --git a/matita/components/binaries/matex/ground.ml b/matita/components/binaries/matex/ground.ml
index 91d85bc36..7eebedb7d 100644
--- a/matita/components/binaries/matex/ground.ml
+++ b/matita/components/binaries/matex/ground.ml
@@ -56,6 +56,13 @@ let rec rev_map_append map l r = match l with
    | []       -> r
    | hd :: tl -> rev_map_append map tl (map hd :: r)
 
+let rec split_at x = function
+   | l when x <= 0 -> [], l
+   | []       -> [], []
+   | hd :: tl -> 
+      let l1, l2 = split_at (pred x) tl in
+      hd :: l1, l2
+
 let error s = raise (Error s)
 
 let log s = P.eprintf "MaTeX: %s\n%!" s