Every planar map is four colorable

類似資料

• Map coloring, polyhedra, and the four-color problem
  著者:: Barnette, David
  出版事項: (1983)
• Planar graphs: theory and algorithms
  著者:: Nishizeki, Takao, 等
  出版事項: (1988)
• Map color theorem
  著者:: Ringel, Gerhard
  出版事項: (1974)
• Qualitative theory of planar differential systems: with 123 figures and 10 tables
  著者:: Dumortier, Freddy, 等
  出版事項: (2006)
• Graphs
  著者:: Berge, Claude
  出版事項: (1985)