By Weimin Han

ISBN-10: 0387235361

ISBN-13: 9780387235363

This quantity presents a posteriori errors research for mathematical idealizations in modeling boundary worth difficulties, specifically these coming up in mechanical purposes, and for numerical approximations of various nonlinear variational difficulties. the writer avoids giving the consequences within the so much basic, summary shape in order that it's more straightforward for the reader to appreciate extra sincerely the fundamental rules concerned. Many examples are incorporated to teach the usefulness of the derived mistakes estimates.

*Audience*

This quantity is acceptable for researchers and graduate scholars in utilized and computational arithmetic, and in engineering.

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**Additional info for A Posteriori Error Analysis via Duality Theory: With Applications in Modeling and Numerical Approximations**

**Sample text**

Is V-elliptic ifthere is a constant m > 0 such that and a ( . ) is symmetric if a ( u ,v ) = a ( v ,u ) V u , v E V. For a ( . 17). THEOREM 1-16 (Lax-Milgram Lemma) Let V be a Hilbert space. Assume a ( . , -) is a bounded, V-elliptic bilinear form on V, t! E V*. 17). 17). With the Lax-Milgram lemma, it is easy to show that these problems all admit a unique solution. 6). The Lax-Milgram lemma can be applied for an existence and uniqueness study of more general linear elliptic partial differential equations.

We note that ul E w11p(R)if and only if 1 < a 2 / p . An early systematic study of singular behavior around a comer for the solution of an elliptic problem was done by Lehman, cf. [105]. The model problem considered in that paper is the Dirichlet problem for the equation + where R is an open planar domain and part of its boundary d R consists of two analytic arcs rl and r2,which meet at the origin and form there an internal 27 Preliminaries angle w > 0. Assume ri(i = 1 , 2 ) is an analytic curve of which the origin 0 is a regular point.

30) with We now look at two concrete examples. 26 ( A N OBSTACLE PROBLEM) A representative example of the elliptic variational inequality of the first kind is given by the obstacle problem. The problem is to determine the equilibrium position of an elastic membrane passing through the boundary of a planar domain, lying above an obstacle of height $, and being subject to the action of a vertical force of density T f , here 7 is the elastic tension of the membrane, and f is a given function. Denote by R the planar domain, and by r for its boundary.

### A Posteriori Error Analysis via Duality Theory: With Applications in Modeling and Numerical Approximations by Weimin Han

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