@prefix psr: <http://data.loterre.fr/ark:/67375/PSR> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

psr: a skos:ConceptScheme .
psr:-LLND57KL-D
  skos:prefLabel "algèbre associative"@fr, "associative algebra"@en ;
  a skos:Concept ;
  skos:narrower psr:-KFG41696-F .

psr:-KFG41696-F
  skos:definition """In mathematics, a Ringel–Hall algebra is a generalization of the Hall algebra, studied by Claus Michael Ringel (1990). It has a basis of equivalence classes of objects of an abelian category, and the structure constants for this basis are related to the numbers of extensions of objects in the category. 
<br/>(Wikipedia, The Free Encyclopedia, <a href="https://en.wikipedia.org/wiki/Ringel%E2%80%93Hall_algebra">https://en.wikipedia.org/wiki/Ringel%E2%80%93Hall_algebra</a>)"""@en ;
  dc:created "2023-08-18"^^xsd:date ;
  dc:modified "2023-08-24"^^xsd:date ;
  a skos:Concept ;
  skos:inScheme psr: ;
  skos:broader psr:-LLND57KL-D ;
  skos:prefLabel "Ringel-Hall algebra"@en, "algèbre de Ringel-Hall"@fr ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Ringel%E2%80%93Hall_algebra> .