Thank you  Professor MacFarlane !

        I tried this one :

\documentclass{article}

\usepackage{amsmath}

\usepackage{unicode-math}

\usepackage{amsfonts}

\newcommand{\boxright}{\ensuremath{%

  \mathrel{\Box\kern-1.5pt\raise1pt\hbox{$\mathord{\rightarrow}$}}}}

\begin{document}

$A\boxright B$

\end{document}


    but it doesn't work, I thought these packages are pandoc can handle  (https://pandoc.org/MANUAL.html). 



On Monday, August 26, 2019 at 2:48:03 PM UTC+8, John MacFarlane wrote:
>
>
> Adding a package won't help in this case. The texmath library 
> doesn't understand \boxright. 
>
> However, you could write your own macro to redefine 
> \boxright to something pandoc can handle, and include 
> this macro in your tex document. 
>
> 吴小安 <nant...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <javascript:>> writes: 
>
> > Hi, I try to convert a tex  document  to word, everything is fine, but 
> the 
> > $boxright$ can not convert ([WARNING] Could not convert TeX math 'A 
> > \boxright C', rendering as TeX: A \boxright C ) 
> > 
> >  I don't know how to add  "\usepackage{pifont}" to the pandoc, could you 
> > tell me how can I do it ? Thank you very much ! 
> > 
> >                     
> > 
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