The current problem I'm working on it creating a better density function
for transformations of single random variables in sympy.stats. I'd like to
be able to do transform a random variable X and change its interval
expr = X**2 # Or exp(X) or (X + mu)/sigma or anything...
I = pspace(expr).domain.set # Usually [0, oo) or (-oo, oo) or [a,b]
z = Symbol('z', domain=lambdify(expr, X)(I))
Can anyone tell me how to do this with the current assumptions system?
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