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, Preface
This Student's Solutions Guide for Discrete Mathematics and Its Applications, seventh edition,
contains several useful and important study aids.
• SOLUTIONS TO ODD-NUMBERED EXERCISES
The bulk of this work consists of solutions to all the odd-numbered exercises in
the text. These are not just answers, but complete, worked-out solutions, showing how
the principles discussed in the text and examples are applied to the problems. I have also
added bits of wisdom, insights, warnings about errors to avoid, and extra comments that
go beyond the question as posed. Furthermore, at the beginning of each section you will
find some general words of advice and hints on approaching the exercises in that section.
• REFERENCES FOR CHAPTER REVIEWS
Exact page references, theorem and example references, and answers are provided as a
guide for all the chapter review questions in the text. This will make reviewing for
tests and quizzes particularly easy.
• A GUIDE TO WRITING PROOFS
Near the end of this book is a section on writing proofs, a skill that most stu-
dents find difficult to master. Proofs are introduced formally in Chapter 1 (and proofs by
mathematical induction are studied in Chapter 5), but exercises throughout the text ask
for proofs of propositions. Reading this section when studying Sections 1.6-1.8, and then
periodically thereafter, will be rewarded, as your proof-writing ability grows.
• REFERENCES AND ADVICE ON THE WRITING PROJECTS
Near the end of this book you will find some general advice on the Writing Projects
given at the end of each chapter. There is a discussion of various resources available in the
mathematical sciences (such as Mathematical Reviews and the World Wide Web), tips on
doing library research, and some suggestions on how to write well. In addition, there
is a rather extensive bibliography of books and articles that will be useful when
researching these projects. We also provide specific hints and suggestions for each project,
with pointers to the references; these can be found in the solutions section of this manual,
at the end of each chapter.
• SAMPLE CHAPTER TESTS
Near the end of this book you will find a sequence of 13 chapter tests, comparable
to what might be given in a course. You can take these sample tests in a simulated test
setting as practice for the real thing. Complete solutions are provided, of course.
• PROBLEM-SOLVING TIPS AND LIST OF COMMON MISTAKES
People beginning any endeavor tend to make the same kinds of mistakes. This is
especially true in the study of mathematics. I have included a detailed list of common
misconceptions that students of discrete mathematics often have and the kinds of errors
they tend to make. Specific examples are given. It will be useful for you to review this list
from time to time, to make sure that you are not falling into these common traps. Also
included in this section is general advice on solving problems in mathematics, which you
will find helpful as you tackle the exercises.
• CRIB SHEETS
Finally, I have prepared a set of 13 single-page "crib sheets," one for each chapter
of the book. They provide a quick summary of all the important concepts, definitions, and
lll
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