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On numerical approximation in bifurcation theory. (English) Zbl 0687.65057
Recherches en Mathématiques Appliquées, 13. Paris etc.: Masson; Berlin etc.: Springer-Verlag. ix, 164 p. (1989).
Consider a parametrized equation $$(1)\quad F(\lambda,u)=0,$$ where $$F: {\mathbb{R}}\times V\to Z$$ and V, Z are real Banach spaces. Typically, for the computation of solution branches of (1) finite-dimensional approximations $$(2)\quad F_ h(\lambda,u)=0$$ of (1) have to be introduced. This monograph presents an analysis of the convergence and of error estimates for the solutions of (2), when u is a regular solution, a turning point or a simple bifurcation point of (1). After several introductory examples, some results about the approximation error of linear elliptic problems are given, and in Chapter 3 the main results about the approximation of regular solution branches of (1) are developed.
These results are applied in Chapter 4 and 5 to the case of a simple limit point and a simple bifurcation point on the trivial branch, respectively. Then, in Chapter 6 a form of the Lyapunov-Schmidt procedure is used to handle simple bifurcations from general branches and Chapter 7 gives an outlook to related problems. The results in this monograph are in essence generalized versions of the earlier results of F. Brezzi, J. Rappaz and P. A. Raviart [Numer. Math. 36, 1-25 (1980; Zbl 0488.65021), ibid. 37, 1-28 (1981; Zbl 0525.65036), ibid. 38, 1-30 (1981; Zbl 0525.65037)] and J. Descloux and J. Rappaz [RAIRO, Anal. Numer. 16, 319-349 (1982; Zbl 0505.65016)]. There is no consideration of other approaches to this approximation problem, as, for example, those of J. Fink and the reviewer [SIAM J. Numer. Anal. 20, 732-746 (1983; Zbl 0525.65041) and Numer. Math. 45, 323-343 (1984; Zbl 0555.65034)].
Reviewer: W.C.Rheinboldt

##### MSC:
 65J15 Numerical solutions to equations with nonlinear operators 65-02 Research exposition (monographs, survey articles) pertaining to numerical analysis 65H17 Numerical solution of nonlinear eigenvalue and eigenvector problems 47J25 Iterative procedures involving nonlinear operators 65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs 35J65 Nonlinear boundary value problems for linear elliptic equations