@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:-HT4QK75C-T
  skos:prefLabel "surface de Riemann"@fr, "Riemann surface"@en ;
  a skos:Concept ;
  skos:narrower psr:-FD4W1XFM-3 .

psr:-XPFQM0ZH-H
  skos:prefLabel "géométrie projective"@fr, "projective geometry"@en ;
  a skos:Concept ;
  skos:narrower psr:-FD4W1XFM-3 .

psr: a skos:ConceptScheme .
psr:-RN57KZJ9-9
  skos:prefLabel "analyse complexe"@fr, "complex analysis"@en ;
  a skos:Concept ;
  skos:narrower psr:-FD4W1XFM-3 .

psr:-FD4W1XFM-3
  dc:created "2023-06-30"^^xsd:date ;
  skos:inScheme psr: ;
  skos:broader psr:-HT4QK75C-T, psr:-XPFQM0ZH-H, psr:-RN57KZJ9-9 ;
  a skos:Concept ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Riemann_sphere>, <https://fr.wikipedia.org/wiki/Sph%C3%A8re_de_Riemann> ;
  skos:definition """In mathematics, the Riemann sphere, named after Bernhard Riemann, is a model of the extended complex plane: the complex plane plus one point at infinity. This extended plane represents the extended complex numbers, that is, the complex numbers plus a value ∞ for infinity. With the Riemann model, the point ∞ is near to very large numbers, just as the point 0 is near to very small numbers. The extended complex numbers are useful in complex analysis because they allow for division by zero in some circumstances, in a way that makes expressions such as 1/0 = ∞ well-behaved. For example, any rational function on the complex plane can be extended to a holomorphic function on the Riemann sphere, with the poles of the rational function mapping to infinity. More generally, any meromorphic function can be thought of as a holomorphic function whose codomain is the Riemann sphere. 
<br/>(Wikipedia, The Free Encyclopedia, <a href="https://en.wikipedia.org/wiki/Riemann_sphere">https://en.wikipedia.org/wiki/Riemann_sphere</a>)"""@en, """En mathématiques, la sphère de Riemann est une manière de prolonger le plan des nombres complexes avec un point additionnel à l'infini, de manière que certaines expressions mathématiques deviennent convergentes et élégantes, du moins dans certains contextes. Déjà envisagée par le mathématicien Carl Friedrich Gauss, elle est baptisée du nom de son élève Bernhard Riemann. 
<br/>(Wikipedia, L'Encylopédie Libre, <a href="https://fr.wikipedia.org/wiki/Sph%C3%A8re_de_Riemann">https://fr.wikipedia.org/wiki/Sph%C3%A8re_de_Riemann</a>)"""@fr ;
  skos:prefLabel "sphère de Riemann"@fr, "Riemann sphere"@en ;
  dc:modified "2023-06-30"^^xsd:date .