src/HOL/Integ/Int.thy
changeset 8949 d46adac29b71
parent 5582 a356fb49e69e
child 9214 9454f30eacc7
--- a/src/HOL/Integ/Int.thy	Wed May 24 18:40:01 2000 +0200
+++ b/src/HOL/Integ/Int.thy	Wed May 24 18:41:09 2000 +0200
@@ -9,6 +9,7 @@
 Int = IntDef +
 
 instance int :: order (zle_refl,zle_trans,zle_anti_sym,int_less_le)
+instance int :: plus_ac0 (zadd_commute,zadd_assoc,zadd_zero)
 instance int :: linorder (zle_linear)
 
 constdefs