--- /dev/null
+# The lambda-term \Omega
+# This book is not accepted in AUT-QE because [y:'type'] is not allowed
+# This book is accepted in lambda-delta with sort inclusion but Omega is not
+# valid if sort inclusion is allowed on the term backbone only
+# This book is valid in lambda-delta with unrestricted sort inclusion
+
++l
+@ Delta := [x:[y:'type']'type']<x>x : [x:[y:'type']'type']'type'
+ Omega := <Delta>Delta : 'type'
+-l