TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. It only takes a minute to sign up.
Sign up to join this community
We may notice that the numerator and denominator in the following fraction are not aligned. And, to me it does not look good.
How to align the numerator and denominator?
\documentclass{article}
\usepackage{amsmath,mathrsfs,xcolor,mathtools}
\let\xoverline\overline % supply your definition
\begin{document}
\begin{equation}
\dfrac{1-k^{m+n+d}}{1-k}
\end{equation}
\end{document}
The above yields:
Here's a comparison of the proposed solutions; the name next to the fraction doesn't necessarily denote the suggestion author's preference.
\documentclass{article}
\usepackage{amsmath}
\usepackage{mathtools}
\begin{document}
\makebox[2in][l]{1. Original}$\dfrac{1-k^{m+n+d}}{1-k}$
\bigskip
\makebox[2in][l]{2. egreg}$\dfrac{1-k^{m+n+d}}{1-k^{\hphantom{m+n+d}}}$
\bigskip
\makebox[2in][l]{3. projetmbc}$\dfrac{1-k^S}{1-k}, \text{ with $S=m+n+d$}$
\bigskip
\makebox[2in][l]{4. Peter Grill}$\dfrac{1-k^{\mathrlap{m+n+d}}}{1-k}$
\end{document}
Take your pick.
Everybody can add here their personal preference.
\frac{1-k^{m+n+d}}{1-k^{\hphantom{m+n+d}}}\dfrac{1-k^{m+n+d}}{1-k\quad}But I'm not sure it looks nicer than the default one.