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

<http://www.irandoc.acir/onto/irandoc/math0006655>
  skos:prefLabel "معادله دیفرانسیل جزئی مرتبه اول"@fa, "first order partial differential equation"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/math0006649> .

<http://www.irandoc.acir/onto/irandoc/math0006649>
  skos:broader <http://www.irandoc.acir/onto/irandoc/math0006655> ;
  skos:prefLabel "معادله توماس"@fa, "thomas equation"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .