Oblique cancellation with plain TeX

[Donald Arseneau]

Rodolfo Medina<rodolfo.medina at gmail.com>   and  David Carlisle write:

\input picture
\catcode`\@=11

\RequirePackage{cancel}
\let\zzcancel\cancel
\def\cancel#1{{%
\let\line\LaTeX at line
\zzcancel{#1}}}

  Undefined control sequence.
\@cancel ...eight \unitlength \p@ \canc at thinlines
                                                   {\/\raise \dimen@ \hbox {\...

Hmm, that probably means that \thinlines was undefined, because cancel.sty does
  \let\canc at thinlines\thinlines

Maybe put \show\thinlines in the document after \input picture.
Check for a definition of \thinlines in autopict.sty.
Maybe post the versions of each of those files.


-- 
Donald Arseneau,    TRIUMF CMMS,    604-222-1047x6295