Reduction of variational inequalities with irregular operators on a ball to regular operator equations

We propose a method for reducing variational inequalities defined by general smooth irregular operators on a ball in a Hilbert space to equivalent regular operator equations. The mentioned equations involve the operator of metric projection on the boundary of the ball. We establish conditions which guarantee the local strong monotonicity of the obtained equations. We discuss applications to the problem of finding normed eigenvectors of nonlinear operators.