Nonlinear, conditionally stable, singularly perturbed boundary-relation problems

Consider the nonlinear, singularly perturbed, vector boundary relation problem x$\sp\prime$ = f(t,x,y,ε), εy$\sp\prime$ = g(t,x,y,ε), L(x(0),y(0),ε) = α\sb0, R(x(1),y(1),ε) = α\sb1. Suppose that there exist smooth maps $\phi$,P,A$\sb1$,A$\sb2$ such that for all appropriate (t,x): (1) g(t,x,$\phi$(t,x),0) = 0, (2) P(t,x) $\cdot$ D$\sb3$g(t,x,$\phi$(t,x),0)P(t,x)$\sp{-1}$ = Diag(A$\sb1$(t,x),A$\sb2$(t,x)), and (3) the spectrum of A$\sb1$(t,x) is bounded away and to the left of the imaginary axis and the spectrum of A$\sb2$(t,x) is bounded away and to the right of the imaginary axis. Suppose also that p$\sb0$(t) is a solution of the reduced differential equation p$\sb0\sp\prime$(t) = f(t,p$\sb0$(t),$\phi$(t,p$\sb0$(t)),0) and that L(p$\sb0$(0),$\phi$(0,p$\sb0$(0),0) = 0 and R(p$\sb0$(1),$\phi$(1,p$\sb0$(1)),0) = 0. If L and R are of a special type (projections onto complementary sets of variables) Hadlock has shown (J. Diff. Eq. 14, 498-517) that the full problem has a bounded family of solutions (x(t,ε),y(t,ε)) defined for all ε sufficiently small and α in some neighborhood of 0. It is also clear in this special case what reduced set of boundary conditions (cancellation law) determine p\sbα(t) = x(t,0+). A corollary of the main result of this paper extends Hadlock's result to allow for an arbitrary set of nonlinear boundary relations L and R subject to the invertibility of a certain linear operator. The proof makes use of the local invariant manifolds of the boundary layer equation along solutions of the reduced differential equation. The vectors x and y may belong to arbitrary Banach spaces.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mathematics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Pollack, David Howard

Contributors dc:contributor

• Albrecht, Felix

• Mathematics

Statement dc:rights

• Copyright 1989 Pollack, David Howard

Language dc:language

eng

Identifier

AAI8924922
(UMI)AAI8924922

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/20198