src/HOL/Library/DAList.thy
changeset 49834 b27bbb021df1
parent 47308 9caab698dbe4
child 51126 df86080de4cb
     1.1 --- a/src/HOL/Library/DAList.thy	Fri Oct 12 15:08:29 2012 +0200
     1.2 +++ b/src/HOL/Library/DAList.thy	Fri Oct 12 18:58:20 2012 +0200
     1.3 @@ -17,7 +17,7 @@
     1.4  
     1.5  subsection {* Type @{text "('key, 'value) alist" } *}
     1.6  
     1.7 -typedef (open) ('key, 'value) alist = "{xs :: ('key \<times> 'value) list. (distinct o map fst) xs}"
     1.8 +typedef ('key, 'value) alist = "{xs :: ('key \<times> 'value) list. (distinct o map fst) xs}"
     1.9    morphisms impl_of Alist
    1.10  proof
    1.11    show "[] \<in> {xs. (distinct o map fst) xs}" by simp