(*lines)
Is a sequence of linear entities concurrent?

        Two or more linear entities are concurrent if they all
        intersect at a single point.

        Parameters
        ==========

        lines : a sequence of linear entities.

        Returns
        =======

        True : if the set of linear entities are concurrent,
        False : otherwise.

        Notes
        =====

        Simply take the first two lines and find their intersection.
        If there is no intersection, then the first two lines were
        parallel and had no intersection so concurrency is impossible
        amongst the whole set. Otherwise, check to see if the
        intersection point of the first two lines is a member on
        the rest of the lines. If so, the lines are concurrent.

        See Also
        ========

        sympy.geometry.util.intersection

        Examples
        ========

        >>> from sympy import Point, Line
        >>> p1, p2 = Point(0, 0), Point(3, 5)
        >>> p3, p4 = Point(-2, -2), Point(0, 2)
        >>> l1, l2, l3 = Line(p1, p2), Line(p1, p3), Line(p1, p4)
        >>> l1.is_concurrent(l2, l3)
        True

        >>> l4 = Line(p2, p3)
        >>> l4.is_concurrent(l2, l3)
        False
Is a sequence of linear entities concurrent?
Is a sequence of linear entities concurrent?
def is_concurrent(*lines):
        """Is a sequence of linear entities concurrent?

        Two or more linear entities are concurrent if they all
        intersect at a single point.

        Parameters
        ==========

        lines : a sequence of linear entities.

        Returns
        =======

        True : if the set of linear entities are concurrent,
        False : otherwise.

        Notes
        =====

        Simply take the first two lines and find their intersection.
        If there is no intersection, then the first two lines were
        parallel and had no intersection so concurrency is impossible
        amongst the whole set. Otherwise, check to see if the
        intersection point of the first two lines is a member on
        the rest of the lines. If so, the lines are concurrent.

        See Also
        ========

        sympy.geometry.util.intersection

        Examples
        ========

        >>> from sympy import Point, Line
        >>> p1, p2 = Point(0, 0), Point(3, 5)
        >>> p3, p4 = Point(-2, -2), Point(0, 2)
        >>> l1, l2, l3 = Line(p1, p2), Line(p1, p3), Line(p1, p4)
        >>> l1.is_concurrent(l2, l3)
        True

        >>> l4 = Line(p2, p3)
        >>> l4.is_concurrent(l2, l3)
        False

        """

        # Concurrency requires intersection at a single point; One linear
        # entity cannot be concurrent.
        if len(lines) <= 1:
            return False

        try:
            # Get the intersection (if parallel)
            p = lines[0].intersection(lines[1])
            if len(p) == 0:
                return False

            # Make sure the intersection is on every linear entity
            for line in lines[2:]:
                if p[0] not in line:
                    return False
            return True
        except AttributeError:
            return False
def is_concurrent ( * lines ) : # Concurrency requires intersection at a single point; One linear # entity cannot be concurrent. if len ( lines ) <= 1 : return False try : # Get the intersection (if parallel) p = lines [ 0 ] . intersection ( lines [ 1 ] ) if len ( p ) == 0 : return False # Make sure the intersection is on every linear entity for line in lines [ 2 : ] : if p [ 0 ] not in line : return False return True except AttributeError : return False