[texhax] Oblique cancellation with plain TeX

James Diamond jim.diamond at acadiau.ca
Sat Jan 5 00:34:50 CET 2019

On Fri, Jan  4, 2019 at 20:51 (+0000), Barbara Beeton wrote:

> James Diamond has added to this interchange:

>> On Fri, Jan  4, 2019 at 19:14 (+0000), Rodolfo Medina wrote:

>>> Philip Taylor <P.Taylor at Rhul.Ac.Uk> writes:

>>>> Maybe if you were to post a GIF/PNG/JPG/PDF of the effect you are trying to
>>>> create, we non-mathematicians might be better placed to help you ...

>>> The following is a simple example: to be processed with simply `latex file'.  I
>>> want the same but with plain TeX...  Thanks,

>>> Rodolfo

>>> \documentclass[preview,border=12pt,varwidth]{standalone}
>>> \usepackage{cancel}
>>> \begin{document}
>>> \abovedisplayskip=0pt
>>> \[
>>> \frac{a\cancel{b}}{\cancel{b}}=a
>>> \]
>>> \end{document}

>> What is wrong with

>> $$ {a\rlap{$b$}/ \over \rlap{$b$}/} = a$$

>> (Aside from the fact that if $b = 0$ then Bad Things are happening?)

> maybe it would be better to have the slash lapped over the target?

Hi Barbara,

I tried both and they looked identical on my screen.  In one test.
But as the next message in my inbox says, it wasn't the solution
to the general problem.


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