Abstract
A class of penalty function methods for the solution of nonlinear variational inequalities with obstacles <–Au, v–u> ⩽ 0 für alle v ⩾ ψ in the Sobolev space W1, p (ω) is studied. The (nonlinear) penalty equations are solved by finite element techniques; the order of convergence of this procedure which depends on the regularity of the solution as well as on the finite elements used is investigated.

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