Hi!
I am new to sympy, and my first attempt was to integrate exp(-x^2):
In [1]: from sympy import *
In [2]: x=Symbol('x'); integrate(exp(-x**2),x)
Out[2]: Integral(exp(-x**2), x)
I expected erf(x) as result of the integration (times some constant),
but got Integral(exp(-x**2), x) instead. But sympy knows about erf.
This is obvious when I try "integrate(exp(-x**2)*erf(x), x)". Why is
erf not recognized as integral of exp(-x**2)?
Thanks
Benjamin
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