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Normal coverings of hyperelliptic real algebraic curves

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Bujalance, E. and Cirre, F.J. and Gamboa, J. M. (2007) Normal coverings of hyperelliptic real algebraic curves. Conformal geometry and dynamics, 11 . pp. 107-127. ISSN 1088-4173

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Official URL: http://www.ams.org/journals/ecgd/2007-11-09/S1088-4173-07-00163-4/S1088-4173-07-00163-4.pdf




Abstract

We consider normal (possibly) branched, finite-sheeted coverings $ \pi:X\rightarrow X'$ between hyperelliptic real algebraic curves. We are interested in the topology of such coverings and also in describing them in terms of algebraic equations. In this article we completely solve these two problems in case $ X$ has the maximum number of ovals within its genus. We first analyze the topological features and ramification data of such coverings. For each isomorphism class we then describe a representative, with defining polynomial equations for $ X$ and for $ X'$, formulae for generators of the covering transformation group, and a rational formula for the covering $ \pi:X\rightarrow X'$.


Item Type:Article
Uncontrolled Keywords:Klein surfaces; Topology of real algebraic varieties; Fuchsian groups and automorphic functions
Subjects:Sciences > Mathematics > Algebra
ID Code:17274
Deposited On:29 Nov 2012 11:32
Last Modified:01 Mar 2016 18:26

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