Brualdi R.A. Introductory Combinatorics

5th Edition. — Pearson Education Asia Limited and China Machine Press, 2009. — 618 p. — ISBN: 0136020402This trusted best-seller emphasizes combinatorial ideas–including the pigeon-hole principle, counting techniques, permutations and combinations, Pólya counting, binomial coefficients, inclusion-exclusion principle, generating functions and recurrence relations, combinatortial structures (matchings, designs, graphs), and flows in networks. The Fifth Edition clarifies the exposition throughout and adds a wealth of new exercises. Appropriate for one- or two-semester, junior- to senior-level combinatorics courses.