完美图(perfect graph)是一种特殊的简单图,若图G的任意一个节点导出图H的色数χ(H)等于H的团数,则称G是χ完美图。若图G的任意一个节点导出子图H的独立数α(H)等于H的团划分数,则称G是α完美图,弱完美图猜想:G是χ完美图的充分必要条件是G为α完美图;或等价地,完美图的补图是完美图。由于它已获证,并称为完美图定理,这就允许不必区别χ完美图和α完美图,而统称为完美图,强完美图猜想:G是完美图当且仅当G和G的补图GC都不含长大于3的奇圈作为节点导出子图,这个猜想至今尚未得到证明。
The definition of the k-perfect hyper-graph is given,which is an extension of the perfect graph.
定义了k-完美超图,使其成为完美图的推广。
参考来源 - 几个特殊超图在完美图上的应用·2,447,543篇论文数据,部分数据来源于NoteExpress
作品《瞬间》灵感来源于跳水健儿在入水的美妙瞬间,层层轻波与放射的水花构成完美图画。
The Moment was inspired from a wonderful moment when diving athletes dive into water. The wave and spray built a beautiful scene.
因此,我们为你准备了这二者的绝美壁纸组合,你可以下载并欣赏,在你的电脑上体验完美图景。
For you, we have collected and combined all the wallpaper from both, so you can download and enjoy them on your existing operating-system.
它们的不同是对世界的两种看法,在审美趣味和对世界的态度方面是不同的,然而各自产生可视事物的完美图画。
Their difference is the world's two views, and the aesthetic tastes of the world's attitude is different, but their visual things have the perfect picture.
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