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HOME > JOURNALS BY SUBJECT > MATHEMATICS > IJM
International Journal of Mathematics (IJM)
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Volume: 20, Issue: 8(2009) pp. 1069-1080     DOI: 10.1142/S0129167X09005650
Abstract | Full Text (PDF, 407KB) | References
Title: ON THE CONNECTEDNESS OF THE LOCUS OF REAL ELLIPTIC-HYPERELLIPTIC RIEMANN SURFACES
Author(s):
JOSÉ A. BUJALANCE
Departamento de Matemáticas Fundamentales, Facultad de Ciencias, UNED, 28040 Madrid, Spain

ANTONIO F. COSTA
Departamento de Matemáticas Fundamentales, Facultad de Ciencias, UNED, 28040 Madrid, Spain

ANA M. PORTO
Departamento de Matemáticas Fundamentales, Facultad de Ciencias, UNED, 28040 Madrid, Spain
History:
Received 14 December 2006
Revised 3 March 2008
Abstract:
A Riemann surface X of genus g > 2 is elliptic-hyperelliptic if it admits a conformal involution h such that the orbit space X/〈h〉 has genus one. This elliptic-hyperelliptic involution h is unique for g > 5 [1]. In a previous article [3], we established the non-connectedness of the subspace of real elliptic-hyperelliptic algebraic curves in the moduli space of Riemann surfaces of genus g, when g is even and > 5. In this paper we improve this result and give a complete answer to the connectedness problem of the space of real elliptic-hyperelliptic surfaces of genus > 5: we show that is connected if g is odd and has exactly two connected components if g is even; in both cases the closure of in the compactified moduli space is connected.
Keywords:
Riemann surface; elliptic-hyperelliptic involution; real algebraic curve; Moduli space
AMSC numbers: 32G15, 30F10, 14H55

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