en infinito depende de beta, si beta es mayor que 1 en infinito tiende a 0 si es menor o igual a 1 tiende a infinito
\(\int x^{-\beta} dx = \frac{x^{-\beta+1}}{-\beta+1} \to_{x \to +\infty} 0 \iff -\beta+1 < 0 \iff β > 1\).
\(\int x^{-\beta} dx = \frac{x^{-\beta+1}}{-\beta+1} \to_{x \to +\infty} 0 \iff -\beta+1 < 0 \iff β > 1\).