# Make font size of numerator the same as denominator?

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?

Thanks.

• I would prefer 2\pi n k/K_F. – Andrew Swann May 19 '14 at 17:16
• The size is the same, but the denominator has capital letters, which are bigger. – egreg May 19 '14 at 17:19
• For such large superscripts it is recommended to use \exp instead: $\exp (-j \frac{2 \pi n k}{K_F} )$ or $\exp (-2 \pi n j k /K_F )$. – Gonzalo Medina May 19 '14 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 May 19 '14 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). – Gonzalo Medina May 19 '14 at 18:23

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[utf8x]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{cfr-lm}
\usepackage{mathtools, nccmath, textcomp, relsize}

\DeclareMathAlphabet{\mathsi}{T1}{clm}{m}{si}

\begin{document}

$e^{-j \frac{2 π n k}{K_{\!F}}}$%

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

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

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

\end{document} • Sorry: I don't understand what's happening. I loaded a .png of the result and it doesn't display. – Bernard May 19 '14 at 20:01
• Look at your browser tab it's not loading the page. Imgur is down – percusse May 19 '14 at 20:15