A characterization of double coverings of curves

2015 ◽  
Vol 150 (3-4) ◽  
pp. 465-474
Author(s):  
Takao Kato ◽  
Gerriet Martens
1990 ◽  
Vol 42 (4) ◽  
pp. 747-761 ◽  
Author(s):  
Jin Ho Kwak ◽  
Jaeun Lee

AbstractRecently, M. Hofmeister [4] counted all nonisomorphic double coverings of a graph by using its Ζ2 cohomology groups, and J. Kwak and J. Lee [5] did the same work for some finite-fold coverings. In this paper, we give an algebraic characterization of isomorphic graph bundles, from which we get a formula to count all nonisomorphic graph-bundles. Some applications to wheels are also discussed.


2008 ◽  
Vol 92 (1) ◽  
pp. 35-43
Author(s):  
Luis Fuentes García

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