Comment #3 on issue 3490 by [email protected]: stats.Normal not taking symbolic standard deviation (wants 'positive')
http://code.google.com/p/sympy/issues/detail?id=3490
The integration routines will probably need to know that it's positive in order to produce meaningful results. We could make a new symbol with the positive attribute but I suspect that this would screw with their math.
Probably the solution is to give a helpful error message that suggests the correct behavior as jrioux did above.
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