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


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

  • 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
    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
    Jun 4, 2016 at 18:14
  • I wrote \bf instead \bm
    – Shika93
    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{}.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.