Geometry and algebra of real forms of complex curves

Details Geometry and algebra of real forms of complex curves Geometry and algebra of real forms of complex curves

1999-11-04

arxiv.org/abs/math/9911028v1

Mathematics

Complex Variables

19 pages, AmsTex

Scientific paper

Let Y be a complex algebraic curve and let [Y]={X_1,...,X_n} be the set of all real algebraic curves X_i with complexification X_i(C)=Y, such that the real points X_i(R) divide X_i(C). We find all such families [Y]. According to Harnak theorem a number |X_i| of connected components of X_i(R) satifies by the inequality |X_i|<= g+1, where g is the genus of Y. We prove that SUM |X_i| <= 2g-(n-9) 2^{n-3}-2 <= 2g+30 and these estimates are exact.

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