Second Order Elliptic Variational Inequality Of The Multigrid Method

In this papef,we construCt a new type of multigrid method for the solution of theLagrange linear finite element discretization of a kind of elliptic variational inequality.Full multigrid method and cascadic multigrid method are applied to this kind ofproblem. And we apply the new method of choosing iterate numbers on each level incascadic multigrid to it. Theorotical results and numerica1 experiments are given toshow the advamage of the methods.