A posteriori estimators for obstacle problems by the hypercircle method
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- Braess, D., Hoppe, R.H.W. & Schöberl, J. Comput. Visual Sci. (2008) 11: 351. doi:10.1007/s00791-008-0104-2
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A posteriori error estimates for the obstacle problem are established in the framework of the hypercircle method. To this end, we provide a general theorem of Prager–Synge type. There is now no generic constant in the main term of the estimate. Moreover, the role of edge terms is elucidated, and the analysis also applies to other types of a posteriori error estimators for obstacle problems.