Hello!
Is there any way to instruct sympy to use real numbers only?
In [1]: from sympy import *
In [2]: x = Symbol('x', real=True)
In [3]: sqrt(x**2-3)
Out[3]: I*(3 - x**2)**(1/2)
Why is sqrt(x**2-3) transformed in that way that it uses the imaginary
unit? This makes it hard for me to turn the output into a native
python expression using eval().
Thanks,
Fabian
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