Cancel Package

Installation

Download the cancel package here: ftp://ftp.dante.de/tex-archive/help/Catalogue/entries/cancel.html

Mac OS X

You can install the cancel package on Mac by downloading cancel.zip, unzipping, and moving cancel.sty to ~/Library/texmf/tex/latex.

Usage

To use the cancel package in a LaTeX document, you have to include the following in your preamble:

\usepackage{cancel}

There are two handy functions available from the cancel package: cancel and cancelto.

To use cancel:

\cancel{ a }

To use cancelto:

\cancel{ \infty }{ a }

An example of using the cancel commands is given here:

Latex Source	Result
\dfrac{\partial\phi}{\partial t} +\dfrac{\partial\left(u_{i}\phi\right)}{\partial x_{i}} = \dfrac{\partial}{\partial x_{i}}\left( D_{\phi}\dfrac{\partial\phi}{\partial x_{i}} \right)
\cancel{ \dfrac{\partial\phi}{\partial t} } +\dfrac{\partial\left(u_{i}\phi\right)}{\partial x_{i}} = \dfrac{\partial}{\partial x_{i}}\left( D_{\phi}\dfrac{\partial\phi}{\partial x_{i}} \right)
\dfrac{\partial\phi}{\partial t} +\dfrac{\partial\left(u_{i}\phi\right)}{\partial x_{i}} = \cancelto{0}{ \dfrac{\partial}{\partial x_{i}}\left( D_{\phi}\dfrac{\partial\phi}{\partial x_{i}} \right) }
\dfrac{\partial\phi}{\partial t} +\dfrac{\partial\left(u_{i}\phi\right)}{\partial x_{i}} =\cancelto{0}{ \dfrac{\partial}{\partial x_{i}}\left( \dfrac{1}{ \cancelto{\infty}{Pr} } \,\,\,\,\,\,\,\,\dfrac{\partial\phi}{\partial x_{i}} \right) }

Using Cancel Package in LyX

You can use the cancel package from LyX by including the following in your preamble:

\usepackage{cancel}

You can do this by opening your LyX document and clicking Document > Settings..., then picking the "Preamble" item from the sidebar. You can then add the line to your preamble.

To use it in the document, you have to type \cancel{. The "cancel" and the "{" bracket should both appear in red, and a matching brace "}" should automatically appear. If it doesn't, you probably forgot to add the above \usepackage to your preamble.

To use the \cancelto{}{} command, first type \cancelto{, and the matching brackets should appear. Next, copy this pair of brackets, and choose paste after the first pair.