Planar map graphs
Planar map graphs
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DOI:
10.1145/276698.276865
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发表时间:
1998
期刊:
影响因子:
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通讯作者:
C. Papadimitriou
中科院分区:
文献类型:
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作者:
Zhi;Michelangelo Grigni;C. Papadimitriou
We introduce and study a modi ed notion of planarity, in which two regions of a map are considered adjacent when they share any point of their boundaries (not an edge, as standard planarity requires). We seek to characterize the abstract graphs realized by such map adjacencies. We prove some preliminary properties of such graphs, and give a polynomial time algorithm for the following restricted problem: given an abstract graph, decide whether it is realized by a map in which at most four regions meet at any point. The general recognition problem remains open.