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"""
=============
Mathtext Demo
=============
Use Matplotlib's internal LaTeX parser and layout engine. For true LaTeX
rendering, see the text.usetex option.
"""
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.plot([1, 2, 3], 'r', label=r'$\sqrt{x^2}$')
ax.legend()
ax.set_xlabel(r'$\Delta_i^j$', fontsize=20)
ax.set_ylabel(r'$\Delta_{i+1}^j$', fontsize=20)
ax.set_title(r'$\Delta_i^j \hspace{0.4} \mathrm{versus} \hspace{0.4} '
r'\Delta_{i+1}^j$', fontsize=20)
tex = r'$\mathcal{R}\prod_{i=\alpha_{i+1}}^\infty a_i\sin(2 \pi f x_i)$'
ax.text(1, 1.6, tex, fontsize=20, va='bottom')
fig.tight_layout()
plt.show()
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