Combinatorics: A Guided Tour by David R. Mazur

By David R. Mazur

Combinatorics is arithmetic of enumeration, lifestyles, development, and optimization questions relating finite units. this article specializes in the 1st 3 forms of questions and covers simple counting and lifestyles ideas, distributions, producing services, recurrence family members, Pólya conception, combinatorial designs, mistakes correcting codes, partly ordered units, and chosen functions to graph concept together with the enumeration of timber, the chromatic polynomial, and introductory Ramsey thought. the one must haves are single-variable calculus and familiarity with units and uncomplicated evidence techniques.

The textual content emphasizes the manufacturers of pondering which are attribute of combinatorics: bijective and combinatorial proofs, recursive research, and counting challenge class. it's versatile adequate for use for undergraduate classes in combinatorics, moment classes in discrete arithmetic, introductory graduate classes in utilized arithmetic courses, in addition to for autonomous learn or examining courses.

What makes this article a guided travel are the nearly 350 studying questions unfold all through its 8 chapters. those questions supply checkpoints for studying and get ready the reader for the end-of-section workouts of which there are over 470. such a lot sections finish with commute Notes that upload colour to the fabric of the part through anecdotes, open difficulties, feedback for additional interpreting, and biographical information regarding mathematicians fascinated about the discoveries.

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Example: counting circular arrangements In how many ways can we seat a group of four people around a circular table? Consider two seatings the same provided that each person has the same left- and right-neighbors. Let Œ4 be the set of people. Begin with the 4Š D 24 permutations of Œ4, and then consider two permutations equivalent if, when placed around a table, each person has the same left- and right-neighbors. 1; 3; 4; 2/ where we have used Á to denote the equivalence relation. 3; 4; 2; 1/ around the table.

20. (from Measure Theory by Paul R. Halmos, Springer-Verlag, 1950) Let S be a set. Suppose that s is an element of S , T is a subset of S , and F is a set of subsets of S . How many statements of the form X R Y are possible, where X and Y are each taken from fS; s; T; F g and R is taken from f2; Âg? Classify each statement as always true, possibly true, or always false. 2 Counting, overcounting, and the sum principle In this section we continue our study of basic counting problems by discussing several examples.

In a given lottery drawing, how many different tickets would win the Match-4 prize? 7. How many 4-character passwords are possible if each character is taken from an nset? What is the smallest n that guarantees at least one billion different passwords? Answer the same two questions but for 8-character passwords. 8. Consider the phone number 289-3447. How many alphabetic phone numbers can be made from this number using the letters on the phone buttons? For example, BUYEGGS is one possibility and ATX-DIGR is another.

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