Comment #2 on issue 1477 by goodrich.ben: Printing with double subscripts
http://code.google.com/p/sympy/issues/detail?id=1477

Happy to write tests, but I am not sure how to automatically test printing.  
Of
course, I can define various symbols and verify that latex() does not throw  
an error,
but how does one automatically test that the latex markup is reasonable  
without
looking at it? The latex() function was not throwing an error before, it  
was just
making latex markup that would not compile to reasonable output.

Is there a way to put a simple and correct .tex file into the sympy tree  
like:

\documentclass{article}
\begin{document}
$\beta_{13,2}$
\end{document}

and then generate a corresponding document from within sympy and assert  
that the diff
is empty?


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