Preface to the Third Edition
The third edition of the book is a thoroughly rewritten version of the 1999
second edition. New material was included, some of the old material was
discarded, and a large portion of the remainder was reorganized or revised.
The total number of pages has increased by about 10 percent.
Aside from incremental improvements, the changes aim to bring the
book up-to-date with recent research progress, and in harmony with the major
developments in convex optimization theory and algorithms that have
occurred in the meantime. These developments were documented in three
of my books： the 2015 book Convex Optimization Algorithms, the 2009
book Convex Optimization Theory, and the 2003 book Convex Analysis
and Optimization coauthored with Angelia Nedic and Asuman Ozdaglar.
A major difference is that these books have dealt primarily with convex, possibly
nondifferentiable, optimization problems and rely on convex analysis,
while the present book focuses primarily on algorithms for possibly nonconvex
differentiable problems, and relies on calculus and variational analysis.
Having written several interrelated optimization books, I have come to
see nonlinear programming and its associated duality theory as the lynchpin
that holds together deterministic optimization. I have consequently set as an
objective for the present book to integrate the contents of my books, together
with internet-accessible material, so that they complement each other and
form a unified whole. I have thus provided bridges to my other works with
extensive references to generalizations, discussions, and elaborations of the
analysis given here, and I have used throughout fairly consistent notation and
mathematical level.
Another connecting link of my books is that they all share the same style：
they rely on rigorous analysis, but they also aim at an intuitive exposition that
makes use of geometric visualization. This stems from my belief that success
in the practice of optimization strongly depends on the intuitive as well as
the analytical understanding of the underlying theory and algorithms.
Some of the more prominent new features of the present edition are：
a An expanded coverage of incremental methods and their connections to
stochastic gradient methods, based in part on my 2000 joint work with
Angelia Nedic; see Section 2.4 and Section 7.3.2.
b A discussion of asynchronous distributed algorithms based in large part
on my 1989 Parallel and Distributed Computation book coauthored
xvii
xviii Preface to the Third Edition
with John Tsitsiklis; see Section 2.5.
c A discussion of the proximal algorithm and its variations in Section 3.6,
and the relation with the method of multipliers in Section 7.3.
d A substantial coverage of the alternating direction method of multipliers
ADMM in Section 7.4, with a discussion of its many applications and
variations, as well as references to my 1989 Parallel and Distributed
Computation and 2015 Convex Optimization Algorithms books.
e A fairly detailed treatment of conic programming problems in Section
6.4.1.
f A discussion of the question of existence of solutions in constrained optimization,
based on my 2007 joint work with Paul Tseng [BeT07], which
contains further analysis; see Section 3.1.2.
g Additional material on network flow problems in Section 3.8 and 6.4.3,
and their extensions to monotropic programming in Section 6.4.2, with
references to my 1998 Network Optimization book.
h An expansion of the material of Chapter 4 on Lagrangemultiplier theory,
using a strengthened version of the Fritz John conditions, and the notion
of pseudonormality, based on my 2002 joint work with Asuman Ozdaglar.
i An expansion of the material of Chapter 5 on Lagrange multiplier algorithms,
with references to my 1982 Constrained Optimization and
Lagrange Multiplier Methods book.
The book contains a few new exercises. As in the second edition, many
of the theoretical exercises have been solved in detail and their solutions have
been posted in the books internet site
http：www.athenasc.comnonlinbook.html
These exercises have been marked with the symbolsWWW. Many other exercises
contain detailed hints andor references to internet-accessible sources.
The books internet site also contains links to additional resources, such as
many additional solved exercises from my convex optimization books, computer
codes, my lecture slides from MIT Nonlinear Programming classes, and
full course contents from the MIT OpenCourseWare OCW site.
I would like to express my thanks to the many colleagues who contributed
suggestions for improvement of the third edition. In particular, let
me note with appreciation my principal collaborators on nonlinear programming
topics since the 1999 second edition： Angelia Nedic, Asuman Ozdaglar,
Paul Tseng, Mengdi Wang, and Huizhen Janey Yu.
Dimitri P. Bertsekas
June, 2016
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