plane.py 文件源码

def equals(self, o):
        """
        Returns True if self and o are the same mathematical entities.

        Examples
        ========

        >>> from sympy import Plane, Point3D
        >>> a = Plane(Point3D(1, 2, 3), normal_vector=(1, 1, 1))
        >>> b = Plane(Point3D(1, 2, 3), normal_vector=(2, 2, 2))
        >>> c = Plane(Point3D(1, 2, 3), normal_vector=(-1, 4, 6))
        >>> a.equals(a)
        True
        >>> a.equals(b)
        True
        >>> a.equals(c)
        False
        """
        if isinstance(o, Plane):
            a = self.equation()
            b = o.equation()
            return simplify(a / b).is_constant()
        else:
            return False