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src/HOL/HOL.thy
changeset 6027 9dd06eeda95c
parent 5786 9a2c90bdadfe
child 6289 062aa156a300 
--- a/src/HOL/HOL.thy	Fri Dec 11 17:16:23 1998 +0100
+++ b/src/HOL/HOL.thy	Fri Dec 11 18:56:30 1998 +0100
@@ -141,6 +141,8 @@
   "*Ex1"        :: [idts, bool] => bool             ("(3\\<exists>!_./ _)" [0, 10] 10)
 
 
+syntax (xsymbols)
+  "op -->"      :: [bool, bool] => bool             (infixr "\\<longrightarrow>" 25)
 
 (** Rules and definitions **)
isabelle