得到了图的条件色数的上界和达到上界的图类.主要结论是:χ,(G)≤△^2+1,等号成立的充分必要条件是图G为Moore图,即圈C5,Petersen图,Hoffman-Singleton图,以及可能存在的57度正则图.
The upper bound of conditional chromatic number of graphs and the graphs satisfying this bound are obtained. The main result is χ,(G)≤△^2+1, here equality holds if and only if G are Moore graphs.