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$\infty$
$$\infty$$
$]-\infty, +\infty[$
$$]-\infty, +\infty[$$
$\lim_{x \to +\infty} f(x)$
$$\lim_{x \to +\infty} f(x)$$
$\sum_{n=1}^{\infty} \frac{1}{n^2}$
$$\sum_{n=1}^{\infty} \frac{1}{n^2}$$