Comment #9 on issue 3117 by [email protected]: -+inf with pretty printer and Float('inf')
http://code.google.com/p/sympy/issues/detail?id=3117
Other than calling different mechanisms, which can lead to different answers (c.f. log(-oo) vs. log(-inf)), I'm not sure. Maybe it's that floating point infinity just represents a number beyond the given precision, whereas symbolic infinity is closer to the mathematical definition.
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