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From the Preface: "The material in this book is based on notes for a course which I gave several times at Brown University. The target of the course was juniors and seniors majoring in applied mathematics, engineering and other sciences. My basic goal in the course was to teach standard methods, or what I regard as a basic "bag of tricks". In my opinion the material contained here, for the most part, does not depart widely from traditional subject matter. One such departure is the discussion of discrete linear systems. Besides being interesting in its own right, this topic is included because the treatment of such systems leads naturally to the use of discrete Fourier series, discrete Fourier transforms, and their extension, the Z-transform. On making the transition to continuous systems we derive their continuous analogues, viz., Fourier series, Fourier transforms, Fourier integrals and Laplace transforms. A main advantage to the approach taken is that a wide variety of techniques are seen to result from one or two very simple but central ideas. Above all, this course is intended as being one which gives the student a "can-do" frame of mind about mathematics. Students should be given confidence in using mathematics and not be made fearful of it. I have, therefore, forgone the theorem-proof format for a more informal style. Finally, a concerted effort was made to present an assortment of examples from diverse applications with the hope of attracting the interest of the student, and an equally dedicated effort was made to be kind to the reader."
This marks the 100th volume to appear in the Applied Mathematical
Sci ences series. Partial Differential Equations, by Fritz John,
the first volume of the series, appeared in 1971. One year prior to
its appearance, the then mathematics editor of Springer-Verlag,
Klaus Peters, organized a meeting to look into the possibility of
starting a series slanted toward applications. The meeting took
place in New Rochelle, at the home of Fritz and Char lotte John.
K.O. Friedrichs, Peter Lax, Monroe Donsker, Joe Keller, and others
from the Courant Institute (previously, the Institute for Mathemat
ical Sciences) were present as were Joe LaSalle and myself, the two
of us having traveled down from Providence for the meeting. The
John home, a large, comfortable house, especially lent itself to
the informal, relaxed, and wide-ranging discussion that ensued.
What emerged was a consensus that mathematical applications
appeared to be poised for a period of growth and that there was a
clear need for a series committed to applied mathematics. The first
paragraph ofthe editorial statement written at that time reads as
follows: The mathematization of all sciences, the fading of
traditional scientific boundaries, the impact of computer
technology, the growing importance of mathematical-computer
modeling and the necessity of scientific planning all create the
need both in education and research for books that are introductory
to and abreast of these developments."
From the Preface: "The material in this book is based on notes for
a course which I gave several times at Brown University. The target
of the course was juniors and seniors majoring in applied
mathematics, engineering and other sciences. My basic goal in the
course was to teach standard methods, or what I regard as a basic
"bag of tricks." In my opinion the material contained here, for the
most part, does not depart widely from traditional subject matter.
One such departure is the discussion of discrete linear systems.
Besides being interesting in its own right, this topic is included
because the treatment of such systems leads naturally to the use of
discrete Fourier series, discrete Fourier transforms, and their
extension, the Z-transform. On making the transition to continuous
systems we derive their continuous analogues, viz., Fourier series,
Fourier transforms, Fourier integrals and Laplace transforms. A
main advantage to the approach taken is that a wide variety of
techniques are seen to result from one or two very simple but
central ideas. Above all, this course is intended as being one
which gives the student a "can-do" frame of mind about mathematics.
Students should be given confidence in using mathematics and not be
made fearful of it. I have, therefore, forgone the theorem-proof
format for a more informal style. Finally, a concerted effort was
made to present an assortment of examples from diverse applications
with the hope of attracting the interest of the student, and an
equally dedicated effort was made to be kind to the reader."
This marks the 100th volume to appear in the Applied Mathematical
Sci ences series. Partial Differential Equations, by Fritz John,
the first volume of the series, appeared in 1971. One year prior to
its appearance, the then mathematics editor of Springer-Verlag,
Klaus Peters, organized a meeting to look into the possibility of
starting a series slanted toward applications. The meeting took
place in New Rochelle, at the home of Fritz and Char lotte John.
K.O. Friedrichs, Peter Lax, Monroe Donsker, Joe Keller, and others
from the Courant Institute (previously, the Institute for Mathemat
ical Sciences) were present as were Joe LaSalle and myself, the two
of us having traveled down from Providence for the meeting. The
John home, a large, comfortable house, especially lent itself to
the informal, relaxed, and wide-ranging discussion that ensued.
What emerged was a consensus that mathematical applications
appeared to be poised for a period of growth and that there was a
clear need for a series committed to applied mathematics. The first
paragraph ofthe editorial statement written at that time reads as
follows: The mathematization of all sciences, the fading of
traditional scientific boundaries, the impact of computer
technology, the growing importance of mathematical-computer
modeling and the necessity of scientific planning all create the
need both in education and research for books that are introductory
to and abreast of these developments.
This collection of articles has its origin in a meeting which took
place June 12-15, 1989, on the grounds of Salve Regina College in
Newport, Rhode Island. The meeting was blessed by beautiful, balmy
weather and an idyllic setting. The sessions themselves took place
in Ochre Court, one of the elegant and stately old summer cottages
for which Newport is acclaimed. Lectures were presented in the
grand ballroom overlooking the famous Cliff Walk and Block Island
Sound. Counter to general belief, the pleasant surroundings did not
appear to encourage truancy or in any other way diminish the
quality of the meeting. On the contrary, for the four days of the
meeting there was a high level of excitement and optimism about the
new perspectives in turbulence, a tone that carried over to lively
dinner and evening discussions. The participants represented a
broad range of backgrounds, extending from pure mathemat ics to
experimental engineering. A dialogue began with the first speakers
which cut across the boundaries and gave to the meeting a mood of
unity which persisted."
These notes originate from a one semester course which forms part
of the "Math Methods" cycle at Brown. In the hope that these notes
might prove useful for reference purposes several additional
sections have been included and also a table of contents and index.
Although asymptotic analysis is now enjoying a period of great
vitality, these notes do not reflect a research oriented course.
The course is aimed toward people in applied mathematics, physics,
engineering, etc., who have a need for asymptotic analysis in their
work. The choice of subjects has been largely dictated by the
likelihood of application. Also abstraction and generality have not
been pursued. Technique and computation are given equal prominence
with theory. Both rigorous and formal theory is presented --very
often in tandem. In practice, the means for a rigorous analysis are
not always available. For this reason a goal has been the
cultivation of mature formal reasoning. Therefore, during the
course of lectures formal presentations gradually eclipse rigorous
presentations. When this occurs, rigorous proofs are given as
exercises or in the case of lengthy proofs, reference is made to
the Reading List at the end.
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