Hi!  My student, William Flynn, has been working a lot this summer using
sympy--thanks for all of the efforts on this project.   We're doing some
work in a windows environment and find that pretty printing (to generate
pngs) still has a problem.  Our hack at the moment is to use the python
subprocessing module to call latex and later run yap.  We need to clean
things up so that we check for existence of latex on the user's machine,
etc--but is this the approach that the community would like to take?  We
also considered tried to go the matplotlib route to generate pngs, but ran
into a problem with long equations (which ironically, was a problem in latex
as well).
Also, we have some rather long expressions involving exponentials, dirac
delta functions, etc. and latex has difficulty breaking them up
automatically.  In the mathematical literature, it would seem that people
generally do this themselves using several
align statements.  One possibility that we are considering is breaking up
the expression by numbers of terms, but in sympy,
is there an easy way to determine if for example a '+' sign is inside of a
function, or outside of a function?  Also, while this may work for us, might
some kind of "printing_strategies" class be useful, which a user could
subclass?

Cheers,
William

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