How to draw a group?
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Alexander Zvonkin
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Article
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1998
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Elsevier Science
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English
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A map is at the same time a group. To represent a map (that is, a graph drawn on the sphere or on another surface) we usually use a pair of permutations on the set of the 'ends' of edges. These permutations generate a group which we call a cartographic group. The main motivation for the study of the