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Author: William A. Stein
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\documentclass{article}
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\usepackage[all]{xy}
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\begin{document}
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$$\xymatrix{
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& X_0(37)\ar[dl]\ar[dr]\\
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E & & F}$$
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$$y^2 = x^6 + 14x^5 + 35x^4 + 48x^3 + 35x^2 + 14x + 1$$
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$q - 2q^2 - 3q^3 + 2q^4 - 2q^5 + 6q^6 - q^7 + 6q^9 + \cdots$
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% 4q^{10} - 5q^{11} - 6q^{12} - 2q^{13} + \cdots$
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\vspace{2ex}
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$q + q^3 - 2q^4 - q^7 - 2q^9 + 3q^{11} - 2q^{12} - 4q^{13} + \cdots$
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\end{document}