Coding the Real Locus
نویسنده
چکیده
Let X 0 (N) be the Atkin-Lehner quotient of the modular curve X0(N) associated to the Fricke involution wN . Assume N ≥ 5 prime and endow the real locus X 0 (N)(R) with the real topology. In this paper we revisit a special case of a result due to Ogg on the connected components of X 0 (N)(R). Then we obtain a formula for the homology class of each connected component of X 0 (N)(R) in terms of Manin symbols.
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