test_residues.py 文件源码

def test_expressions_failing():
    assert residue(1/(x**4 + 1), x, exp(I*pi/4)) == -(S(1)/4 + I/4)/sqrt(2)

    n = Symbol('n', integer=True, positive=True)
    assert residue(exp(z)/(z - pi*I/4*a)**n, z, I*pi*a) == \
        exp(I*pi*a/4)/factorial(n - 1)
    assert residue(1/(x**2 + a**2)**2, x, a*I) == -I/4/a**3