Four color theorem - related articles and key terms

Related articles: Klein bottle   Mathematical proof   Mathematics   Planar graph   Theorem   Torus

Key terms: appel and haken   checked   colors   colors suffice   configuration   conjecture   contiguous   counterexample   discharging   discharging procedure   each vertex   euler characteristic   five color theorem   five colors   four color   four color theorem   four colours   fredrick   graph   graph coloring   graph theory   guthrie   kempe   kempe chain   minimal counterexample   neighbors   number of vertices   planar   planar graph   proof   proving   red and blue neighbors   reducible configurations   remaining regions   same color   set of configurations   single vertex with degree   tait   teorema   theorem   three colors   torus   touches   touches every   triangulated   two regions   unavoidable set   vertex   vertex of degree   vertices

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