diff -r 65a546c2b8ed -r 7ef6ba42914b sum.thy
--- a/sum.thy	Mon Jan 24 16:03:03 1994 +0100
+++ b/sum.thy	Wed Jan 26 17:53:27 1994 +0100
@@ -17,7 +17,7 @@
    Abs_Sum	:: "(['a,'b,bool] => bool) => 'a+'b"
    Inl		:: "'a => 'a+'b"
    Inr		:: "'b => 'a+'b"
-   case		:: "['a+'b, 'a=>'c,'b=>'c] =>'c"
+   sum_case	:: "['a+'b, 'a=>'c,'b=>'c] =>'c"
 rules
   Inl_Rep_def	"Inl_Rep == (%a. %x y p. x=a & p)"
   Inr_Rep_def	"Inr_Rep == (%b. %x y p. y=b & ~p)"
@@ -29,6 +29,6 @@
     (*defining the abstract constants*)
   Inl_def  		"Inl == (%a. Abs_Sum(Inl_Rep(a)))"
   Inr_def 		"Inr == (%b. Abs_Sum(Inr_Rep(b)))"
-  case_def	"case == (%p f g. @z.  (!x. p=Inl(x) --> z=f(x))\
-\                                    & (!y. p=Inr(y) --> z=g(y)))"
+  sum_case_def	"sum_case == (%p f g. @z.  (!x. p=Inl(x) --> z=f(x))\
+\                                        & (!y. p=Inr(y) --> z=g(y)))"
 end