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四色定理
释义
四色定理
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理学
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four color theorem
四色定理
设图G是一个平面图，图G的面染色（face coloring）是从G的面集合到某个给定颜色集合的映射。进一步，如果图G的某个面染色的颜色集合中有k种颜色，那么称这个面染色为k-面染色（k-face coloring）。图G的k-面染色称为正常k-面染色（proper k-face coloring），如果具有公共边的面染不同颜色，此时称图G是k-面可染的（proper k-face colorable）。四色定理的内容如下：每个无割边的平面图都是4-面可染的。
Mathematics
＞组合数学、组合设计与图论＞图论＞释义
four-color theorem
四色定理
four-color theorem
四色定理
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hydrogen production through water electrolysis
hydrogen production through water-gas shift reaction
hydrogen production via hydrolysis of active metals
hydrogen production via hydrolysis of hydrides
hydrogen prominence
hydrogen proportional counting tube
hydrogen purification
hydrogen recombination
hydrogen recombination line
hydrogen recovery
hydrogen reduction process
hydrogen refueling station
hydrogen region
hydrogen-rich donor
hydrogen rich gas
hydrogen separation and purification
hydrogen separation system
hydrogen spectrum
hydrogen star
hydrogen storage
hydrogen storage alloy
hydrogen storage by highpressure
hydrogen storage by physical adsorption
hydrogen storage capacity
hydrogen storage-complex hydrides
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