@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<http://www.irandoc.acir/onto/irandoc/mathpro1985>
  skos:broader <http://www.irandoc.acir/onto/irandoc/mathpro1961> ;
  skos:prefLabel "وجود راه حل"@fa, "solution existence"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/mathpro1961>
  skos:prefLabel "حل مسئله نظریه معادلات دیفرانسیل"@fa, "a solution of the problem of theory of differential equations"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/mathpro1985> .