1 files changed, 1 insertions, 1 deletions
diff --git a/Empty.thy b/Empty.thy
index 1b339ba..8f5cc8c 100644
--- a/Empty.thy
+++ b/Empty.thy
@@ -17,7 +17,7 @@ axiomatization
   Empty :: Term  ("\<zero>") and
   indEmpty :: "Term \<Rightarrow> Term"  ("(1ind\<^sub>\<zero>)")
 where
-  Empty_form: "\<zero> : U(O)"
+  Empty_form: "\<zero>: U(O)"
 and
   Empty_elim: "\<lbrakk>C: \<zero> \<longrightarrow> U(i); z: \<zero>\<rbrakk> \<Longrightarrow> ind\<^sub>\<zero>(z): C(z)"