theorems [elim??] = sym;

--- a/src/HOL/Calculation.thy	Thu Feb 10 13:34:52 2000 +0100
+++ b/src/HOL/Calculation.thy	Thu Feb 10 13:36:23 2000 +0100
@@ -52,5 +52,7 @@
 
 theorems [trans] = trans                                    (*  =  =  =  *)
 
+theorems [elim??] = sym
+
 
 end;