[texhax] FW: Arrow head too large on \overarrowright

[Herbert Voss]

Am 31.12.2013 12:45, schrieb Bob Tennent:
>
>   > > you've omitted a definition of \m at th.
>
>   > That is a standard macro.
>
> Donald:
>
>    \documentclass{amsbook}
>    \makeatletter
>    \def\overarrow@#1#2#3{\vbox{%
>     \ialign{##\crcr#1{\smaller at than#2}\crcr
>     \noalign{\nointerlineskip\kern.12ex}$\m at th\hfil#2#3\hfil$\crcr}}}
>    \def\smaller at than#1{\ifx\scriptstyle#1\scriptscriptstyle\else
>      \ifx\scriptscriptstyle#1\scriptscriptstyle\else
>      \scriptstyle\fi\fi}
>    \makeatother
>    \begin{document}
>    $\overrightarrow{AB}+\overrightarrow{BC}=\overrightarrow{AC}$
>    \end{document}
>
>    :
>
>    ! Undefined control sequence.
>    <recently read> \m
>
>    l.11 $\overrightarrow{AB}
>                             +\overrightarrow{BC}=\overrightarrow{AC}$

copy and paste ...

\documentclass{amsbook}
   \makeatletter
   \def\overarrow@#1#2#3{\vbox{%
    \ialign{##\crcr#1{\smaller at than#2}\crcr
    \noalign{\nointerlineskip\kern.12ex}$\m at th\hfil#2#3\hfil$\crcr}}}
   \def\smaller at than#1{\ifx\scriptstyle#1\scriptscriptstyle\else
     \ifx\scriptscriptstyle#1\scriptscriptstyle\else
     \scriptstyle\fi\fi}
   \makeatother
   \begin{document}
   $\overrightarrow{AB}+\overrightarrow{BC}=\overrightarrow{AC}$
   \end{document}

Herbert