A complex number
The projection of z onto the Riemann sphere.
assert(proj(complex(1.0)) == complex(1.0)); assert(proj(complex(double.infinity, 5.0)) == complex(double.infinity, 0.0)); assert(proj(complex(5.0, -double.infinity)) == complex(double.infinity, -0.0));
Returns the projection of z onto the Riemann sphere.