Some issues about SymPy 0.7.3 for Maemo 5 :
- "Plot()" using PyGlet has some bug that doesn't open the plotting window (this bug also happens on PC's, no only on Nokia N900). This issue was reported to SymPy group and solved by using some SymPy 0.7.2 code for PyGlet "Plot()";
- the new plotting module on SymPy 0.7.3 needs MatPlotLib >= 1.1.0, but Maemo 5 currently has MatPlotLib 1.0.0, so it doesn't work. I will later try to package MatPlotLib 1.2/1.3 for Maemo 5, solving this issue.

Other issues about SymPy 0.7.3 for Maemo 4 & 5 :
- version 0.7.1 of SymPy interactive shell (which has SymPy icon and isympy script) is not compatible with SymPy 0.7.3 (IPython 0.10.2 is not started, only the Python shell), so I've released "SymPy interactive shell" 0.7.3, see 1st post;
- "tests/" subfolders of python-sympy 0.7.3 source code were removed to save installation space, from 31MB to 20MB.

So, on Maemo 5, SymPy 0.7.3 currently has 2 plotting options : PyGlet "Plot()" and mpmath plotting with MatPlotLib.

While on SymPy 0.7.2 there are 3 plotting options : PyGlet "Plot()", new plotting module and mpmath plotting with MatPlotLib. But SymPy 0.7.2 has some bugs (which were fixed in v0.7.3).