Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Annals of the New York Academy of Sciences
319 (1979), S. 0
ISSN:
1749-6632
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Natural Sciences in General
Notes:
This paper introduces convenient algorithms to determine two properties of the covering space derived from a voltage assignment on an imbedded graph. One algorithm is to count the number of components of the covering. The other is to decide when the covering surface is orientable. The computational advantages of these algorithms are realized mainly when the base graph has more than one vertex or when the voltage group is described by a presentation rather than an explicit specification. The key principle is to consider the voltage values on a cycle basis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1749-6632.1979.tb32796.x
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