@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:-ST8XF8P3-G
  skos:prefLabel "geometric drawing"@en, "construction géométrique"@fr ;
  a skos:Concept ;
  skos:narrower psr:-P7R49LRF-X .

psr: a skos:ConceptScheme .
psr:-P7R49LRF-X
  dc:modified "2024-10-18"^^xsd:date ;
  skos:exactMatch <https://fr.wikipedia.org/wiki/Cha%C3%AEne_de_Steiner>, <https://en.wikipedia.org/wiki/Steiner_chain> ;
  skos:broader psr:-ST8XF8P3-G ;
  skos:prefLabel "chaîne de Steiner"@fr, "Steiner chain"@en ;
  dc:created "2023-07-13"^^xsd:date ;
  a skos:Concept ;
  skos:definition """In geometry, a Steiner chain is a set of n circles, all of which are tangent to two given non-intersecting circles, where n is finite and each circle in the chain is tangent to the previous and next circles in the chain. In the usual closed Steiner chains, the first and last (n-th) circles are also tangent to each other; by contrast, in open Steiner chains, they need not be. The given circles α and β do not intersect, but otherwise are unconstrained; the smaller circle may lie completely inside or outside of the larger circle. In these cases, the centers of Steiner-chain circles lie on an ellipse or a hyperbola, respectively. 
<br/>(Wikipedia, The Free Encyclopedia, <a href="https://en.wikipedia.org/wiki/Steiner_chain">https://en.wikipedia.org/wiki/Steiner_chain</a>)"""@en, """En géométrie, une chaîne de Steiner est une suite finie de cercles tangents à deux cercles fixes disjoints — les « cercles de départ » — , chacun des cercles étant en contact avec le précédent. 
<br/>(Wikipedia, L'Encylopédie Libre, <a href="https://fr.wikipedia.org/wiki/Cha%C3%AEne_de_Steiner">https://fr.wikipedia.org/wiki/Cha%C3%AEne_de_Steiner</a>)"""@fr ;
  skos:inScheme psr: .