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On a possible extension of Hall's theorem to bipartite hypergraphs

โœ Scribed by Ron Aharoni; Ofra Kessler


Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
314 KB
Volume
84
Category
Article
ISSN
0012-365X

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A note on possible extensions of Negami'
โœ Hlin?n๏ฟฝ, Petr ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 239 KB ๐Ÿ‘ 2 views

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