X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Fre%2Freb.ma;h=2c5b129d228e7c87bb4d537c39e47a28cb22dab1;hb=b5cb5cc7230870f757aadbe6b43ee146fe485a6d;hp=73faed3770c6417cacc6eea1089fcc6fb1007b36;hpb=38b251338be469c7bcd75cb9f243fad9ba8f0907;p=helm.git

diff --git a/matita/matita/lib/re/reb.ma b/matita/matita/lib/re/reb.ma
index 73faed377..2c5b129d2 100644
--- a/matita/matita/lib/re/reb.ma
+++ b/matita/matita/lib/re/reb.ma
@@ -14,6 +14,7 @@
 
 include "arithmetics/nat.ma".
 include "basics/lists/list.ma".
+include "basics/core_notation/singl_1.ma".
 
 interpretation "iff" 'iff a b = (iff a b).  
 
@@ -778,4 +779,4 @@ ntheorem der1: ∀S,a,e,e',w. der S a e e' → in_l S w e' → in_l S (a::w) e.
      | #x; #y; #z; #w; #a; #b; #c; #d; #K; ncases (?:False); /2/ ]
 ##| #r1; #r2; #r1'; #r2'; #H1; #H2; #H3; #H4; #H5; #H6;
 
-*)
\ No newline at end of file
+*)