<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Infinite_graph> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/2004/02/skos/core#altLabel>	"chromatic number of the plane" .
<http://caligraph.org/resource/Edward_Nelson>	<http://caligraph.org/ontology/knownFor>	<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#NamedIndividual> .
<http://caligraph.org/resource/Aubrey_de_Grey>	<http://caligraph.org/ontology/knownFor>	<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Open_Problems_in_Mathematics> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/2004/02/skos/core#altLabel>	"problem's" .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://caligraph.org/ontology/Unsolved_problem_in_graph_theory> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/2004/02/skos/core#prefLabel>	"Hadwiger\u2013Nelson problem" .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Infinite_graphs> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/2002/07/owl#sameAs>	<http://dbpedia.org/resource/Hadwiger%E2%80%93Nelson_problem> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Hugo_Hadwiger> .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/2000/01/rdf-schema#label>	"Hadwiger\u2013Nelson problem" .
<http://caligraph.org/resource/Hadwiger%E2%80%93Nelson_problem>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Unsolved_problems_in_graph_theory> .