By Weimin Han

ISBN-10: 0387235361

ISBN-13: 9780387235363

ISBN-10: 038723537X

ISBN-13: 9780387235370

This quantity offers a posteriori errors research for mathematical idealizations in modeling boundary worth difficulties, specially these coming up in mechanical functions, and for numerical approximations of diverse nonlinear variational difficulties. the writer avoids giving the consequences within the such a lot normal, summary shape in order that it truly is more straightforward for the reader to appreciate extra basically the basic rules concerned. Many examples are incorporated to teach the usefulness of the derived errors estimates.

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Extra resources for A Posteriori Error Analysis Via Duality Theory: With Applications in Modeling and Numerical Approximations (Advances in Mechanics and Mathematics)

Example text

As an example, denoting b = ( b l , . . , bd)T, one can verify that any of the following three conditions is sufficient for the V-ellipticity: c or b. e. e. 23) if the inequality holds with c = c and it does not hold for any c < E. 5. measure. There are a lot of papers and monographs devoted to the study of inequalities among norm quantities such as Ilv 11 L2 Ilv 11 L 2 (rl, 11 V v 11 L 2 ( n ) , 11 dvldvl)L2(r,),//Awl/L2(n)for functions v satisfying various smoothness and auxiliary conditions.

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. Consider the boundary value problem 19 Preliminaries Here v = (y, . . , ud)T is the unit outward normal on rN. e. in 0; E L2(0), g E L 2 ( b ) . 17) with We can apply Lax-Milgram Lemma to study the well-posedness of the boundary ~ is a Hilbert space, with the standard value problem.

In this section, we briefly discuss weak formulations of boundary value problems. E HP1(R), then the right hand side of Here we assume f E ~ ~ ( 0 the equation is understood to be the duality pairing ( f , v ) between the spaces H-' (R) and (R). 7) by an arbitrary function v , suitably smooth so that the following calculations are justified, and assumed zero on the boundary. Next, integrate the resulting equation over R, and perform an integration by parts on the left hand side to obtain the integral identity HA S, ~ V U - V v d z =fvdz Finally, observe that both sides of the integral identity make sense even if we only require u , v E H1(R).

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A Posteriori Error Analysis Via Duality Theory: With Applications in Modeling and Numerical Approximations (Advances in Mechanics and Mathematics) by Weimin Han


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