Gonality of the modular curve X1(N)
Abstract
In this paper we compute the gonality over Q of the modular curve X1(N) for all N <= 40 and give upper bounds for each N <= 250. This allows us to determine all N for which X1(N) has infinitely points of degree <= 8. We conjecture that the modular units of Q(X1(N)) are freely generated by f2,...,f[N/2]+1 where fk is obtained from the equation for X1(k).
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