What is <cardinality of this set> of <rational number> ?
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What is the cardinality of this set of rational numbers?
SELECT DISTINCT ?d WHERE { resource:rational_number property:cardinality_of_this_set ?d }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1244890> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2820> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q1244890 wdt:P2820 ?answer}
aleph null