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Note on a possible orgin of the Alps

โœ Scribed by A.J. Bull

Book ID
117120983
Publisher
The Geological Society (London)
Year
1949
Tongue
English
Weight
206 KB
Volume
60
Category
Article
ISSN
0016-7878

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A graph H is a cover of a graph G, if there exists a mapping ฯ• from V (H) onto V (G) such that for every vertex v of G, ฯ• maps the neighbors of v in H bijectively onto the neighbors of ฯ•(v) in G. Negami conjectured in 1987 that a connected graph has a finite planar cover if and only if it embeds in