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+import Mathematics
+
+-- Knowledge Base domain: SocietyCulture
+
+opaque Person : Type
+-- Person extends Entity
+axiom Person.val : Person → Entity
+opaque Place : Type
+-- Place extends Entity
+axiom Place.val : Place → Entity
+opaque City : Type
+-- City extends Place
+axiom City.val : City → Place
+opaque athens : City
+opaque birthyear : Person → Nat
+opaque bornIn : Person → Place → Prop
+axiom fact_bornIn_socrates_athens : bornIn socrates athens