On abstract planarity of graphs in the 3-sphere
Fengchun Lei · Journal of Natural Science of Heilongjiang University · 2006
ly planar graph in S3, and Γ′ a graph obtained by adding a finite number of edges to Γ. The abstract planarity of Γ′ is considered. A necessary and sufficient condition under which Γ′ is abstractly planar is given. Some discussions of planar graph in the viewpoint of flat embedding are done.