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I can't understand why an integral of a fraction doesn't resize the integral symbol by itself.

$\text{SAR}=\int_{campione}\dfrac{\bf{\sigma}(r)|\bf{E}(r)|^2}{\bf{\rho}(r)}dr$

enter image description here

I saw this Big integral sign but with bigints nothing changes (and yes, I loaded the package and I erased all those files that work like a cache). I wouldn't write an instruction to make this resize

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    INHO, using \dfrac in an inline math expression is almost surely an error. If you need to use \dfrac, switch to displaymath style; a side benefit will be that the integral symbol becomes large automatically.
    – Mico
    Jun 4 '16 at 17:57
  • Comment aside\bf{\sigma} won't produce a bold σ. For this you should use \boldsymbol{\sigma} or \bm{\sigma} if you load the bm package.
    – Bernard
    Jun 4 '16 at 18:14
  • I wrote \bf instead \bm
    – Shika93
    Jun 4 '16 at 18:20
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You simply need

$\text{SAR}=\displaystyle\int_{\mathit{campione}}\dfrac{\bf{\sigma}(r)|\bf{E}(r)|^2}{\bf{\rho}(r)}\,dr$,

if it really is an inline, not displayed, math. If not, a solution may be as follows:

\[
\text{SAR}=\int_{\mathit{campione}}\dfrac{\bf{\sigma}(r)|\bf{E}(r)|^2}{\bf{\rho}(r)}\,dr
\]

Using \bf in LaTeX is not recommended. You have, e.g., \mathbf{}.

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