Comment #6 on issue 3555 by [email protected]: Simplify Stats expressions
http://code.google.com/p/sympy/issues/detail?id=3555
To maintain the random variable abstraction I'm revising my suggestion. We
should either
1. make Expectation, Variance, Density etc... operators and then convert
Op(Pow(Normal('X', 0, 1), 2))
into
Op(ChiSquared('X', 1))
Where Op in {Expectation Variance Density ... }
2. Implement the distribution as top-level object idea of issue
http://code.google.com/p/sympy/issues/detail?id=3129
We should not play around with the random variables themselves.
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