more readable divide ops

--- a/src/HOL/Tools/res_clause.ML	Fri Jan 13 17:39:03 2006 +0100
+++ b/src/HOL/Tools/res_clause.ML	Fri Jan 13 17:39:19 2006 +0100
@@ -120,6 +120,8 @@
 		   ("op +", "plus"),
 		   ("op -", "minus"),
 		   ("op *", "times"),
+		   ("Divides.op div", "div"),
+		   ("HOL.divide", "divide"),
 		   ("op -->", "implies"),
 		   ("{}", "emptyset"),
 		   ("op :", "in"),