Error estimates for obstacle problems of higher order

For obstacle problems of higher order involving power growth functionals, a posteriori error estimates using methods in duality theory are proved. These estimates can be viewed as a reliable measure for the deviation of an approximation from the exact solution, which is independent of the concrete numerical scheme under consideration. Bibliography: 11 titles. Published in Zapiski Nauchnykh Seminarov POMI, Vol. 348, 2007, pp. 5–18.