what is the {time of discovery or invention} for {mathematical induction} has {discoverer or inventor} as {Euclid} ?
Euclid developed his theory of geometry in what year?
When did Euclid develop his theory of geometry?
SELECT ?x WHERE { resource:mathematical_induction property:discoverer_or_inventor ?j . ?j property:discoverer_or_inventor resource:Euclid . ?j property:time_of_discovery_or_invention ?x }
select distinct ?value  where {
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?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P61> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q8747> .
?statement <http://www.wikidata.org/entity/P575> ?value. 
} 

SELECT ?value WHERE { wd:Q178377 p:P61 ?s . ?s ps:P61 wd:Q8747 . ?s pq:P575 ?value}