<http://caligraph.org/ontology/Unsolved_problem>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Unsolved_problem_in_geoscience>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_linguistics>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_physics>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_biology>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_medicine>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_mathematics>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_chemistry>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_information_theory>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Lists_of_unsolved_problems> .
<http://caligraph.org/ontology/Unsolved_problem_in_statistics>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_philosophy>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem>	<http://www.w3.org/2000/01/rdf-schema#label>	"Unsolved problem" .
<http://caligraph.org/ontology/Unsolved_problem_in_fair_division>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem_in_astronomy>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .
<http://caligraph.org/ontology/Unsolved_problem>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://www.w3.org/2002/07/owl#Thing> .
<http://caligraph.org/ontology/Unsolved_problem_in_economics>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Unsolved_problem> .