In a Q̄-space of rational functions of u, the ratio x₁/x₀ of a 2×3 configuration is p(u)/q(u) with p, q coprime and not both constant

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In a Q̄-space of rational functions of u, the ratio x₁/x₀ of a 2×3 configuration is p(u)/q(u) with p, q coprime and not both constant · Prove2Me