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


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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

  • 1
    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
    Commented Jun 4, 2016 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
    Commented Jun 4, 2016 at 18:14
  • I wrote \bf instead \bm
    – Shika93
    Commented Jun 4, 2016 at 18:20

1 Answer 1


You simply need


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


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


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