Directrix (conic section)

http://dbpedia.org/resource/Directrix_(conic_section)

rdf:langString Directrix (conic section)
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dbpedia:Conic_section
dbpedia:Conic_section
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<https://global.dbpedia.org/id/B2WXi>
<http://en.wikipedia.org/wiki/Directrix_(conic_section)?oldid=930299160&ns=0>
<http://en.wikipedia.org/wiki/Directrix_(conic_section)>

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