I have a simple question, I would like to make the font-size of the numerator the same as that of my denominator. For example, something like this:

e^{-j \frac{2 \pi n k}{K_F}} 

gives me an ugly looking equation..., where the $K_F$ looks way bigger than the stuff on the top.

Is there a way to make the top and bottom look 'nicer' together?


  • 1
    I would prefer 2\pi n k/K_F. Commented May 19, 2014 at 17:16
  • 1
    The size is the same, but the denominator has capital letters, which are bigger.
    – egreg
    Commented May 19, 2014 at 17:19
  • 2
    For such large superscripts it is recommended to use \exp instead: $\exp (-j \frac{2 \pi n k}{K_F} ) $ or $\exp (-2 \pi n j k /K_F ) $. Commented May 19, 2014 at 17:19
  • @GonzaloMedina Hmm, I suppose those can work, but I would really like to use the $e$ and not exp. Is there a way to simply make the denom smaller?
    – Spacey
    Commented May 19, 2014 at 17:32
  • You could use a scaling factor (but I will not recommend this): $ e^{-j \frac{2 \pi n k}{\smash{\scalebox{.5}{$K_{F}$}}}} $ (requires to load graphicx). Commented May 19, 2014 at 18:23

1 Answer 1


You can obtain something that more or less looks like what you want.

First method: in the denominator you pass in text mode, choose a smaller font size and return to math mode. I give two examples, with \small and footnotesize.

Second method: you use a font that has slanted small caps, like Latin Modern or MinonPro. You declare a new math alphabet to use them in math mode. I give an example with the cfr-lm package, where slanted smallcaps are called sishape.

    \documentclass[12pt, a4paper]{article}


    \usepackage{mathtools, nccmath, textcomp, relsize}



    \[ e^{-j \frac{2 π n k}{K_{\!F}}} \]%

    \[ e^{-j \frac{2 π n k}{\text{\small$ \scriptscriptstyle K_{\!F}$}}} \]%

    \[ e^{-j \frac{2 π n k}{\text{\footnotesize$ \scriptscriptstyle K_{\!F }$}}} \]%

    \[ e^{-j \frac{2 π n k}{\mathsi{k_f}}} \]%



  • Sorry: I don't understand what's happening. I loaded a .png of the result and it doesn't display.
    – Bernard
    Commented May 19, 2014 at 20:01
  • Look at your browser tab it's not loading the page. Imgur is down
    – percusse
    Commented May 19, 2014 at 20:15

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