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\documentclass[pagesize=auto]{scrartcl}
\usepackage{fixltx2e}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{booktabs}
\usepackage{microtype}
\usepackage{hyperref}
\newcommand*{\meta}[1]{\textlangle\textsl{#1}\textrangle}
\newcommand*{\marg}[1]{\texttt{\{}\meta{#1}\texttt{\}}}
\newcommand*{\cmd}[1]{\texttt{\string#1}}
\addtokomafont{title}{\rmfamily}
\title{The \textsf{cancel} package\thanks{This manual corresponds to \textsf{cancel}~v2.1, dated~12--Mar--2000.}}
\author{Donald Arseneau\\\href{mailto:asnd@triumf.ca}{\texttt{asnd@triumf.ca}}}
\date{12--Mar--2000}
\publishers{I contribute this software to the public domain. No rights reserved.}
\begin{document}
\maketitle
\section{Commands:}
\begin{labeling}{\cmd{\cancelto}\marg{value}\marg{expression}}
\item[\cmd{\cancel}] draws a diagonal line (slash) through its argument.
\item[\cmd{\bcancel}] uses the negative slope (a backslash).
\item[\cmd{\xcancel}] draws an X (actually \cmd{\cancel} plus \cmd{\bcancel}).
\item[\cmd{\cancelto}\marg{value}\marg{expression}] draws a diagonal arrow through the \meta{expression}, pointing to the \meta{value}.
\end{labeling}
%
The first three work in math and text mode, but \cmd{\cancelto} is only
for math mode.
The slope of the line or arrow depends on what is being cancelled.
\section{Options:}
Bt default, none of these commands affects the horizontal spacing,
so they might over-print neighboring parts of the formula (or text).
They do add their height to the expression, so there should never be
unintended vertical overlap. There is a package option \texttt{[makeroom]} to
increase the horizontal spacing to make room for the cancellation value.
If you use the color package, then you can declare
%
\begin{verbatim}
\renewcommand{\CancelColor}{<color_command>}
\end{verbatim}
%
and the cancellation marks will be printed in that color (e.\,g., \cmd{\blue}).
However, if you are using color, I recommend lightly shaded blocks rather
than diagonal arrows for cancelling.
The option \texttt{[thicklines]} asks for heavier lines and arrows. This may be
useful when the lines are colored a light shade.
\begin{samepage}
The size (math style) of the \cmd{\cancelto} value depends on package options
according to this table:
%
\begin{center}
\small
\begin{tabular}{@{}llll@{}}
\toprule
\textbf{Current style} & \textbf{\texttt{[samesize]}} & \textbf{\texttt{[smaller]}} & \textbf{\texttt{[Smaller]}} \\
\midrule
\cmd{\displaystyle} & \cmd{\displaystyle} & \cmd{\textstyle} & \cmd{\scriptstyle} \\
\cmd{\textstyle} & \cmd{\textstyle} & \cmd{\scriptstyle} & \cmd{\scriptstyle} \\
\cmd{\scriptstyle} & \cmd{\scriptstyle} & \cmd{\scriptscriptstyle} & \cmd{\scriptscriptstyle} \\
\cmd{\scriptscriptstyle} & \cmd{\scriptscriptstyle} & \cmd{\scriptscriptstyle} & \cmd{\scriptscriptstyle} \\
\bottomrule
\end{tabular}
\end{center}
%
(``\texttt{smaller}'' is the default behavior. It gives textstyle limits in
displaystyle, whereas ``\texttt{Smaller}'' gives scriptstyle limits.)
\end{samepage}
This package is provided without guarantees or support. Drawing slashes
through math to indicate ``cancellation'' is poor design. I don't recommend
that you use this package at all.
\end{document}
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