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Author: William A. Stein
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\documentclass{article}
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\begin{document}
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\Large
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$$y^2 + y = x^3 - x$$
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$$y^2 + y = x^3 + x^2 - 23x - 50$$
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$$y^2 + y = x^3 - x^2 - 10x - 20$$
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$$q + q^3 - 2q^4 - q^7 - 2q^9 + 3q^{11} - 2q^{12} - 4q^{13} + 4q^{16} + 6q^{17} + 2q^{19} + \cdots $$
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$$q \, +\, \frac{\sqrt{5} - 1}{2}q^2 \,-\, \sqrt{5}q^3 \,-\, \frac{\sqrt{5} + 1}{2}q^4
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\, +\, (\sqrt{5} - 1)q^5 + \cdots $$
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\end{document}