>
> We still haven't updated SymPy Live to SymPy 1.0, so the output of 
> some examples may be different. 
>

Thanks! Maybe I expressed myself misleading. Also the output in my 
yupyter notebook did not correspond to what is in the documentation.

I have difficulty to understand the output of the three calls
below which are taken from the doc-pages I cited.
-----------------------------------------------------
from sympy import rf, symbols, factorial, ff, binomial
from sympy.abc import x
n, k = symbols('n k', integer=True)

rf(x**3, 2)                 # ? x**3*(x**3 + 1)

rf(x, k).rewrite(binomial)  # ? RisingFactorial(x, k)

rf(n, k).rewrite(factorial) # ? RisingFactorial(n, k)
-----------------------------------------------------

Perhaps someone can enlighten me what to expect 
and to tell me if the output of SymPy 1.0 is correct?

Peter
 

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