<http://caligraph.org/ontology/System_of_formal_logic>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Formal_system> .
<http://caligraph.org/ontology/System_of_set_theory>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Formal_system> .
<http://caligraph.org/ontology/Formal_system>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Formal_systems> .
<http://caligraph.org/ontology/Formal_system>	<http://www.w3.org/2000/01/rdf-schema#label>	"Formal system" .
<http://caligraph.org/ontology/Formal_system>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://www.w3.org/2002/07/owl#Thing> .
<http://caligraph.org/ontology/Rule_of_inference>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Formal_system> .
<http://caligraph.org/ontology/Formal_system>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/List_of_formal_systems> .
<http://caligraph.org/ontology/Formal_system>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .