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discrete mathematics：elementary and beyodnpdf电子书版本下载
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- 文件页数：304页
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图书目录
1 Let’s Count! 1
1.1 A Party 1
1.2 Sets and the Like 4
1.3 The Number of Subsets 9
1.4 The Approximate Number of Subsets 14
1.5 Sequences 15
1.6 Permutations 17
1.7 The Number of Ordered Subsets 19
1.8 The Number of Subsets of a Given Size 20
2 Combinatorial Tools 25
2.1 Induction 25
2.2 Comparing and Estimating Numbers 30
2.3 Inclusion-Exclusion 32
2.4 Pigeonholes 34
2.5 The Twin Paradox and the Good Old Logarithm 37
3 Binomial Coefficients and Pascal’s Triangle 43
3.1 The Binomial Theorem 43
3.2 Distributing Presents 45
3.3 Anagrams 46
3.4 Distributing Money 48
3.5 Pascals Triangle 49
3.6 Identities in Pascals Triangle 50
3.7 A Birds-Eyc View of Pascals Triangle 54
3.8 An Eagles-Eye View: Fine Details 57
4 Fibonacci Numbers 65
4.1 Fibonaccis Exercise 65
4.2 Lots of Identities 68
4.3 A Forinula for the Fibonacci Nurnbers 71
5 Combinatorial Probability 77
5.1 Events and Probabilities 77
5.2 Independent Repetition of an Experiment 79
5.3 The Law of Large Numbers 80
5.4 The Law of Small Numbers and the Law of Very Large Nuun-bers 83
6 Integers, Divisors, and Primes 87
6.1 Divisibility of Integers 87
6.2 Primes and Their History 88
6.3 Factorization into Primes 90
6.4 On the Set of Primes 93
6.5 Fermat’s“Littlc” Theorem 97
6.6 The Euclidean Algorithm 99
6.7 Congrucnccs 105
6.8 Strange Numbers 107
6.9 Nnnnber Theory and Conmbinatorics 114
6.10 How to Tcst Whether a Number is a Prime? 117
7 Graphs 125
7.1 Even and Odd Degrees 125
7.2 Paths, Cycles, and Connectivity 130
7.3 Eulerian Walks and Hamiltonian Cycles 135
8 Trees 141
8.1 How to Define Trees 141
8.2 How to Grow Trees 143
8.3 How to Count Trees? 146
8.4 How to Store Trees 148
8.5 The Number of Unlabeled Trees 153
9 Finding the Optimum 157
9.1 Finding the Best Tree 157
9.2 The Traveling Salesman Problem 161
10 Matchings in Graphs 165
10.1 A Dancing Problem 165
10.2 Another matching problem 167
10.3 The Main Theorem 169
10.4 How to Find a Perfect Matching 171
11 Combinatorics in Geometry 179
11.1 Intersections of Diagonals 179
11.2 Counting regions 181
11.3 Convex Polygons 184
12 Euler’s Formula 189
12.1 A Planet Under Attack 189
12.2 Planar Graphs 192
12.3 Eulers Formula for Polyhedra 194
13 Coloring Maps and Graphs 197
13.1 Coloring Regions with Two Colors 197
13.2 Coloring Graphs with Two Colors 199
13.3 Coloring graphs with many colors 202
13.4 Mlap Coloring and the Four Color Theorem 204
14 Finite Geometries, Codes,Latin Squares,and Other Pretty Creatures 211
14.1 Small Exotic Worlds 211
14.2 Finite Affine and Projective Planes 217
14.3 Block Designs 220
14.4 Steiner Systems 224
14.5 Latin Squares 229
14.6 Codes 232
15 A Glimpse of Complexity and Cryptography 239
15.1 A Connecticut Class in King Arthur’s Court 239
15.2 Classical Cryptography 242
15.3 How to Save the Last Move in Chess 244
15.4 How to Verify a Password—Without Learning it 246
15.5 How to Find These Primes 246
15.6 Public Key Cryptography 247
16 Answers to Exercises 251
Index 287