• 基本释义

1.In Havel [2] (1969, Journal of Combinatorial Theory, 7:184~186), Havel provided that both 4-cycles and 5-cycles must be excluded to ensure that the plane graphs are 3-colorable.
Havel给出两个反例,如果平面图含有4-圈或有5-圈是不可3-可着色的,因此4-圈和5-圈在证明平面图是3-可着色时必须排除.收藏指正
2.A city of northeast Germany on the Havel River west-southwest of Berlin. It is an industrial center. Population,95, 133.
勃兰登堡德国东北部一城市，位于柏林的西南以西哈弗尔河畔。是一个工业中心。人口95，133收藏指正
3.The 2003 1)Taipei International Book Exhibition held at the 2)Taipei World Trade Center will introduce to Taiwanese readers a number of Czech writers, and will feature a special focus on the works of Vaclav Havel, president of the 3) Czech Republic, according to the organizers.
主办单位表示，在台北世贸中心举办的二○○三年台北国际书展将向台湾读者介绍多位捷克籍作家，并将焦点放在捷克总统瓦克拉夫哈维尔的作品身上。收藏指正
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