fractions
I have an equation using fractions of fractions – much like
\frac{\frac{a}{b}}{\frac{c}{d}}
However, all of the fraction bars are the same width. I'd like to make the central bar wider than the others for improved readability. Is this possible? I've played around with shrinking the fond sizes of the numerator and denominator a bit, but that still doesn't improve readability.
One way to shift your numerators in an italic context would be
{\hss\tiny\kern\fontdimen\@ne\font#2\/\kern-\fontdimen\@ne\font\hss}\cr% Emit numerator [#2]
as for safe ways of looking ahead and adding space or not, you might want to look at latex's definition of \DeclareTextFontCommand which defines \textit and friends to add italic correction at the start or end, depending.
A couple of versions, you probably need to fiddle with the spacing to get exactly what you need but:
\documentclass{article}
\def\cFrac#1#2{%
\begin{array}{@{}c@{}}\multicolumn{1}{c|}{#1}\\%
\hline\multicolumn{1}{|c}{#2}\end{array}}
\def\cFracB#1#2{%
\vcenter{\hbox{\strut$#1$\,\vrule}\hrule\hbox{\strut\vrule\,$#2$}}}
\begin{document}
$ A + \cFrac{B}{C} + \cFrac{D}{E}$.
$ A + \cFracB{B}{C} + \cFracB{D}{E}$.
\end{document}
Best Answer
Some space can be added in the outer nominator/denominator, e.g.: