A singularly perturbed linear two-point boundary-value problem
<p>We consider the following singularly perturbed linear two-point boundary-value problem:</p> <p>Ly(x) ≡ Ω(ε)D_xy(x) - A(x,ε)y(x) = f(x,ε) 0≤x≤1 (1a)</p> <p>By ≡ L(ε)y(0) + R(ε)y(1) = g(ε) ε → 0^+ (1b)</p> <p>Here Ω(ε) is a diagonal...
id |
ndltd-CALTECH-oai-thesis.library.caltech.edu-7610 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-CALTECH-oai-thesis.library.caltech.edu-76102019-12-22T03:09:37Z A singularly perturbed linear two-point boundary-value problem Ferguson, Warren E. <p>We consider the following singularly perturbed linear two-point boundary-value problem:</p> <p>Ly(x) ≡ Ω(ε)D_xy(x) - A(x,ε)y(x) = f(x,ε) 0≤x≤1 (1a)</p> <p>By ≡ L(ε)y(0) + R(ε)y(1) = g(ε) ε → 0^+ (1b)</p> <p>Here Ω(ε) is a diagonal matrix whose first m diagonal elements are 1 and last m elements are ε. Aside from reasonable continuity conditions placed on A, L, R, f, g, we assume the lower right mxm principle submatrix of A has no eigenvalues whose real part is zero. Under these assumptions a constructive technique is used to derive sufficient conditions for the existence of a unique solution of (1). These sufficient conditions are used to define when (1) is a regular problem. It is then shown that as ε → 0^+ the solution of a regular problem exists and converges on every closed subinterval of (0,1) to a solution of the reduced problem. The reduced problem consists of the differential equation obtained by formally setting ε equal to zero in (1a) and initial conditions obtained from the boundary conditions (1b). Several examples of regular problems are also considered.</p> <p>A similar technique is used to derive the properties of the solution of a particular difference scheme used to approximate (1). Under restrictions on the boundary conditions (1b) it is shown that for the stepsize much larger than ε the solution of the difference scheme, when applied to a regular problem, accurately represents the solution of the reduced problem.</p> <p>Furthermore, the existence of a similarity transformation which block diagonalizes a matrix is presented as well as exponential bounds on certain fundamental solution matrices associated with the problem (1).</p> 1975 Thesis NonPeerReviewed application/pdf https://thesis.library.caltech.edu/7610/1/Ferguson_we_1975.pdf https://resolver.caltech.edu/CaltechTHESIS:04112013-102123813 Ferguson, Warren E. (1975) A singularly perturbed linear two-point boundary-value problem. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/3T9F-VQ87. https://resolver.caltech.edu/CaltechTHESIS:04112013-102123813 <https://resolver.caltech.edu/CaltechTHESIS:04112013-102123813> https://thesis.library.caltech.edu/7610/ |
collection |
NDLTD |
format |
Others
|
sources |
NDLTD |
description |
<p>We consider the following singularly perturbed linear two-point boundary-value problem:</p>
<p>Ly(x) ≡ Ω(ε)D_xy(x) - A(x,ε)y(x) = f(x,ε) 0≤x≤1 (1a)</p>
<p>By ≡ L(ε)y(0) + R(ε)y(1) = g(ε) ε → 0^+ (1b)</p>
<p>Here Ω(ε) is a diagonal matrix whose first m diagonal elements
are 1 and last m elements are ε. Aside from reasonable
continuity conditions placed on A, L, R, f, g, we assume the
lower right mxm principle submatrix of A has no eigenvalues
whose real part is zero. Under these assumptions a constructive
technique is used to derive sufficient conditions for the existence
of a unique solution of (1). These sufficient conditions are used to
define when (1) is a regular problem. It is then shown that as
ε → 0^+ the solution of a regular problem exists and converges on
every closed subinterval of (0,1) to a solution of the reduced problem.
The reduced problem consists of the differential equation
obtained by formally setting ε equal to zero in (1a) and initial
conditions obtained from the boundary conditions (1b). Several
examples of regular problems are also considered.</p>
<p>A similar technique is used to derive the properties of the
solution of a particular difference scheme used to approximate (1).
Under restrictions on the boundary conditions (1b) it is shown that
for the stepsize much larger than ε the solution of the difference scheme, when applied to a regular problem, accurately represents
the solution of the reduced problem.</p>
<p>Furthermore, the existence of a similarity transformation
which block diagonalizes a matrix is presented as well as exponential
bounds on certain fundamental solution matrices associated with the problem (1).</p> |
author |
Ferguson, Warren E. |
spellingShingle |
Ferguson, Warren E. A singularly perturbed linear two-point boundary-value problem |
author_facet |
Ferguson, Warren E. |
author_sort |
Ferguson, Warren E. |
title |
A singularly perturbed linear two-point boundary-value problem |
title_short |
A singularly perturbed linear two-point boundary-value problem |
title_full |
A singularly perturbed linear two-point boundary-value problem |
title_fullStr |
A singularly perturbed linear two-point boundary-value problem |
title_full_unstemmed |
A singularly perturbed linear two-point boundary-value problem |
title_sort |
singularly perturbed linear two-point boundary-value problem |
publishDate |
1975 |
url |
https://thesis.library.caltech.edu/7610/1/Ferguson_we_1975.pdf Ferguson, Warren E. (1975) A singularly perturbed linear two-point boundary-value problem. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/3T9F-VQ87. https://resolver.caltech.edu/CaltechTHESIS:04112013-102123813 <https://resolver.caltech.edu/CaltechTHESIS:04112013-102123813> |
work_keys_str_mv |
AT fergusonwarrene asingularlyperturbedlineartwopointboundaryvalueproblem AT fergusonwarrene singularlyperturbedlineartwopointboundaryvalueproblem |
_version_ |
1719305339008974848 |