“…It was also, independently, defined and studied by Taylor [14], for a particular set C. The flow is well defined as all the sides of the evolving polygon become of zero length simultaneously, at finite time T [14]. It should also be noted that the shape of evolving polygons is independent on the choice of the origin [13], thus we may assume, without any loss of generality, that the origin is the shrinking point K(T). An immediate consequence is the strict positivity of the support numbers to the sides of the boundary "K(t) for t < T. For any other choice of the origin, the support numbers, h i (t), will become signed distances according to the definition…”