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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "David Vernon Widder (25 March 1898 – 8 July 1990) was an American mathematician. He earned his Ph.D. at Harvard University in 1924 under George Birkhoff and went on to join the faculty there.He was a co-founder of the Duke Mathematical Journal and the author of the textbook Advanced Calculus." ] ,
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        "http://dbpedia.org/ontology/birthDate" : [ "1898-03-25Z" ] ,
        "http://dbpedia.org/ontology/birthPlace" : [ "http://dbpedia.org/resource/Harrisburg,_Pennsylvania" ] ,
        "http://dbpedia.org/ontology/birthYear" : [ "1898Z" ] ,
        "http://dbpedia.org/ontology/deathDate" : [ "1990-07-08Z" ] ,
        "http://dbpedia.org/ontology/deathYear" : [ "1990Z" ] ,
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