In this paper. we study inextensible flows of a curve on a lightlike surface in Minkowski three-space and give a necessary and sufficient condition for inextensible flows of the curve as a partial differential equation involving the curvatures of the curve on a lightlike surface. Finally. we classify lightlike ruled surfaces in Minkowski three-space and characterize an inextensible ev... https://www.rawafricaonline.com/