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About: Apex graph     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Unit108189659, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: softwareyago:Abstraction100002137yago:Family108078020yago:Group100031264yago:Organization108008335yago:WikicatGraphFamiliesyago:YagoLegalActoryago:YagoLegalActorGeoyago:YagoPermanentlyLocatedEntityyago:SocialGroup107950920yago:Unit108189659 New Facet based on Instances of this Class

In graph theory, a branch of mathematics, an apex graph is a graph that can be made planar by the removal of a single vertex. The deleted vertex is called an apex of the graph. It is an apex, not the apex because an apex graph may have more than one apex; for example, in the minimal nonplanar graphs K5 or K3,3, every vertex is an apex. The apex graphs include graphs that are themselves planar, in which case again every vertex is an apex. The null graph is also counted as an apex graph even though it has no vertex to remove.