Papers › Tetragonal modular quotients X₀^+(N)
Tetragonal modular quotients X₀^+(N)
Petar Orlić
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In this paper we determine all quotient curves X₀^+(N) whose ℚ or ℂ-gonality is equal to $4$. As a consequence, we find several new cases when the modular curve X₀(N) has ℚ-gonality equal to $8$.
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