This book is a concise, self-contained, up-to-date introduction
to extremal combinatorics for nonspecialists. There is a strong
emphasis on theorems with particularly elegant and informative
proofs, they may be called gems of the theory. The author presents
a wide spectrum of the most powerful combinatorial tools together
with impressive applications in computer science: methods of
extremal set theory, the linear algebra method, the probabilistic
method, and fragments of Ramsey theory. No special knowledge in
combinatorics or computer science is assumed - the text is
self-contained and the proofs can be enjoyed by undergraduate
students in mathematics and computer science. Over 300 exercises of
varying difficulty, and hints to their solution, complete the
text.
This second edition has been extended with substantial new
material, and has been revised and updated throughout. It offers
three new chapters on expander graphs and eigenvalues, the
polynomial method and error-correcting codes. Most of the remaining
chapters also include new material, such as the Kruskal-Katona
theorem on shadows, the Lovasz-Stein theorem on coverings, large
cliques in dense graphs without induced 4-cycles, a new lower
bounds argument for monotone formulas, Dvir's solution of the
finite field Kakeya conjecture, Moser's algorithmic version of the
Lovasz Local Lemma, Schoning's algorithm for 3-SAT, the
Szemeredi-Trotter theorem on the number of point-line incidences,
surprising applications of expander graphs in extremal number
theory, and some other new results."
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