English

Dynamical systems method (DSM) for nonlinear equations in Banach spaces

Functional Analysis 2007-05-23 v1

Abstract

Let F:XXF:X\to X be a C\loc2C^2_\loc map in a Banach space XX, and AA be its Fr\`echet derivative at the element w:=w\vew:=w_\ve, which solves the problem ()\dotw=A\ve1(F(w)+\vew)(\ast) \dotw=-A^{-1}_\ve(F(w)+\ve w), w(0)=w0w(0)=w_0, where A\ve:=A+\veIA_\ve:=A+\ve I. Assume that A\ve1c\vek\|A^{-1}_\ve\|\leq c \ve^{-k}, 0<k10<k\leq 1, 0<\ve>\ve00<\ve>\ve_0. Then ()(\ast) has a unique global solution, w(t)w(t), there exists w()w(\infty), and ()F(w())+\vew()=0(\ast\ast) F(w(\infty))+\ve w(\infty)=0. Thus the DSM (Dynamical Systems Method) is justified for equation ()(\ast\ast). The limit of w\vew_\ve as \ve0\ve\to 0 is studied.

Keywords

Cite

@article{arxiv.math/0410479,
  title  = {Dynamical systems method (DSM) for nonlinear equations in Banach spaces},
  author = {A. G. Ramm},
  journal= {arXiv preprint arXiv:math/0410479},
  year   = {2007}
}