Manifesto |
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xix | |
Preface |
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xxi | |
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1 | (22) |
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1.1 Why Is This Book Needed? |
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1 | (1) |
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1.2 Why Is This Book Needed? |
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2 | (2) |
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1.3 The Structure of This Book |
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4 | (12) |
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1.3.1 Our Main Intellectual Targets |
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4 | (2) |
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1.3.2 Allocating Our Targets to Chapters |
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6 | (1) |
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1.3.2.1 Chapter 2: "Doing" Mathematics |
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6 | (1) |
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1.3.2.2 Chapter 3: Sets and Their Algebras |
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6 | (1) |
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1.3.2.3 Chapters 4, 8, 10: Numbers and Numerals |
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7 | (1) |
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1.3.2.4 Chapters 5 and 6: Arithmetic and Summation |
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8 | (2) |
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1.3.2.5 Chapter 7: The Vertigo of Infinity |
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10 | (1) |
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1.3.2.6 Chapter 9: Recurrences |
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11 | (2) |
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1.3.2.7 Chapter 11: The Art of Counting: Combinatorics, with Applications to Probability and Statistics |
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13 | (2) |
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1.3.2.8 Chapters 12 and 13: Graphs and Related Topics |
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15 | (1) |
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1.4 Using the Text in Courses |
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16 | (7) |
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16 | (1) |
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16 | (2) |
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18 | (1) |
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19 | (1) |
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20 | (1) |
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1.4.2 Paths Through the Text for Selected Courses |
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20 | (3) |
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2 "Doing" Mathematics: A Toolkit for Mathematical Reasoning |
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23 | (36) |
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2.1 Rigorous Proofs: Theory vs. Practice |
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24 | (13) |
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2.1.1 Formalistic Proofs and Modern Proofs |
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26 | (1) |
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2.1.1.1 Formalistic proofs, with an illustration |
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26 | (4) |
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2.1.1.2 Modern proofs, with an illustration |
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30 | (4) |
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2.1.1.3 Some elements of rigorous reasoning |
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34 | (1) |
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A Distinguishing name from object |
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34 | (1) |
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34 | (1) |
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C The elements of empirical reasoning |
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35 | (2) |
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2.2 Overview of Some Major Proof Techniques |
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37 | (8) |
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2.2.1 Proof by (Finite) Induction |
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37 | (1) |
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2.2.1.1 Two more sample proofs by induction |
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37 | (2) |
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2.2.1.2 A false "proof" by induction: The critical base case |
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39 | (1) |
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2.2.1.3 The Method of Undetermined Coefficients |
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40 | (2) |
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2.2.2 Proof by Contradiction |
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42 | (1) |
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2.2.2.1 The proof technique |
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42 | (1) |
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2.2.2.2 Another sample proof: There are infinitely many prime numbers |
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43 | (1) |
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2.2.3 Proofs via the Pigeonhole Principle |
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44 | (1) |
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2.2.3.1 The proof technique |
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45 | (1) |
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2.2.3.2 Sample applications/proofs |
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45 | (1) |
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2.3 Nontraditional Proof Strategies |
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45 | (9) |
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2.3.1 Pictorial Reasoning |
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45 | (1) |
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2.3.1.1 The virtuous side of the method |
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45 | (4) |
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2.3.1.2 Handle pictorial arguments with care |
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49 | (2) |
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2.3.2 Combinatorial Intuition and Argumentation |
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51 | (1) |
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2.3.2.1 Summation as a selection problem |
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51 | (1) |
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2.3.2.2 Summation as a rearrangement problem |
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52 | (1) |
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2.3.3 The Computer as Mathematician's Assistant |
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53 | (1) |
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54 | (5) |
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3 Sets and Their Algebras: The Stem Cells of Mathematics |
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59 | (40) |
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59 | (3) |
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62 | (5) |
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3.2.1 Fundamental Set-Related Concepts |
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62 | (2) |
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64 | (3) |
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67 | (13) |
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3.3.1 Binary Relations: Sets of Ordered Pairs |
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68 | (2) |
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70 | (1) |
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3.3.3 Equivalence Relations |
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70 | (2) |
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72 | (1) |
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3.3.4.1 The basics: definitions and generic properties |
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72 | (4) |
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3.3.4.2 The Schroder-Bernstein Theorem |
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76 | (2) |
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3.3.5 Sets, Strings, Functions: Important Connections |
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78 | (2) |
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80 | (14) |
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3.4.1 The Algebra of Propositional Logic |
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81 | (1) |
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3.4.1.1 Logic as an algebra |
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81 | (1) |
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A Propositions: the objects of the algebra |
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81 | (1) |
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B Logical connectives: the algebra's operations |
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82 | (2) |
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C The goal of the game: Theorems |
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84 | (1) |
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3.4.1.2 Semantic completeness: Logic via Truth Tables |
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84 | (1) |
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A Truth, theoremhood, and completeness |
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84 | (1) |
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B The completeness of Propositional Logic |
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85 | (2) |
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C The laws of Propositional Logic as theorems |
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87 | (2) |
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3.4.2 A Purely Algebraic Setting for Completeness |
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89 | (1) |
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3.4.3 Satisfiability Problems and NP-Completeness |
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90 | (4) |
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94 | (5) |
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4 Numbers I: The Basics of Our Number System |
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99 | (28) |
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4.1 Introducing the Three Chapters on Numbers |
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99 | (1) |
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4.2 A Brief Biography of Our Number System |
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100 | (5) |
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4.3 Integers: The "Whole" Numbers |
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105 | (8) |
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4.3.1 The Basics of the Integers: The Number Line |
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106 | (1) |
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4.3.1.1 Natural orderings of the integers |
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106 | (1) |
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4.3.1.2 The order-related laws of the integers |
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107 | (1) |
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4.3.2 Divisibility: Quotients, Remainders, Divisors |
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108 | (2) |
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4.3.2.1 Euclidean division |
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110 | (1) |
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4.3.2.2 Divisibility, divisors, GCDs |
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111 | (2) |
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113 | (5) |
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4.4.1 The Rationals: Special Ordered Pairs of Integers |
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115 | (1) |
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4.4.2 Comparing the Rational and Integer Number Lines |
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115 | (1) |
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4.4.2.1 Comparing Z and Q via their number-line laws |
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116 | (1) |
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4.4.2.2 Comparing Z and Q via their cardinalities |
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117 | (1) |
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118 | (6) |
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4.5.1 Inventing the Real Numbers |
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118 | (1) |
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4.5.2 Defining the Real Numbers via Their Representations |
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119 | (1) |
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4.5.3 Not All Real Numbers Are Rational |
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120 | (1) |
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4.5.3.1 A number-based proof that √2 is not rational: √ ε Q |
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121 | (1) |
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4.5.3.2 A geometric proof that √2 is not rational: √2 ε Q |
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122 | (2) |
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4.6 The Basics of the Complex Numbers |
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124 | (1) |
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125 | (2) |
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5 Arithmetic: Putting Numbers to Work |
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127 | (40) |
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5.1 The Basic Arithmetic Operations |
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127 | (12) |
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5.1.1 Unary (Single-Argument) Operations |
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128 | (1) |
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5.1.1.1 Negating and reciprocating numbers |
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128 | (1) |
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5.1.1.2 Floors, ceilings, magnitudes |
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128 | (1) |
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5.1.1.3 Factorials (of a nonnegative integer) |
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129 | (1) |
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5.1.2 Binary (Two-Argument) Operations |
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130 | (1) |
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5.1.2.1 Addition and subtraction |
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130 | (1) |
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5.1.2.2 Multiplication and division |
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131 | (2) |
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5.1.2.3 Exponentiation and taking logarithms |
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133 | (2) |
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5.1.2.4 Binomial coefficients and Pascal's triangle |
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135 | (3) |
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5.1.3 Rational Arithmetic: A Computational Exercise |
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138 | (1) |
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5.2 The Laws of Arithmetic, with Applications |
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139 | (1) |
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5.2.1 The Commutative, Associative, and Distributive Laws |
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139 | (1) |
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5.3 Polynomials and Their Roots |
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140 | (15) |
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5.3.1 Univariate Polynomials and Their Roots |
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142 | (1) |
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5.3.1.1 The d roots of a degree-k polynomial |
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143 | (2) |
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5.3.1.2 Solving polynomials by radicals |
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145 | (1) |
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A Solving quadratic polynomials by radicals |
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146 | (2) |
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B Solving cubic polynomials by radicals |
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148 | (3) |
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5.3.2 Bivariate Polynomials: The Binomial Theorem |
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151 | (2) |
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5.3.3 Integer Roots of Polynomials: Hilbert's Tenth Problem |
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153 | (2) |
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5.4 Exponential and Logarithmic Functions |
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155 | (4) |
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155 | (1) |
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5.4.2 Learning from Logarithms (and Exponentials) |
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156 | (3) |
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5.5 Pointers to Specialized Topics |
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159 | (4) |
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5.5.1 Norms and Metrics for Tuple-Spaces |
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159 | (2) |
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5.5.2 Edit-Distance: Measuring Closeness in String Spaces |
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161 | (2) |
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163 | (4) |
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6 Summation: A Complex Whole from Simple Parts |
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167 | (48) |
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6.1 The Many Facets of Summation |
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167 | (4) |
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6.2 Summing Structured Series |
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171 | (19) |
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6.2.1 Arithmetic Summations and Series |
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171 | (1) |
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6.2.1.1 General development |
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171 | (1) |
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6.2.1.2 Example #1: Summing the first in integers |
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171 | (4) |
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6.2.1.3 Example #2: Squares as sums of odd integers |
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175 | (4) |
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6.2.2 Geometric Sums and Series |
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179 | (1) |
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6.2.2.1 Overview and main results |
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179 | (1) |
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6.2.2.2 Techniques for summing geometric series |
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180 | (5) |
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6.2.2.3 Extended geometric series and their sums |
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185 | (1) |
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A The summation Sb(1)(n) = Σni=1 ibi |
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186 | (2) |
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B The summations Sb(c)(n) = Σni=1 icbi |
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188 | (2) |
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6.3 On Summing "Smooth" Series |
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190 | (20) |
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6.3.1 Approximate Sums via Integration |
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190 | (3) |
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6.3.2 Sums of Fixed Powers of Consecutive Integers: ΣIc |
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193 | (1) |
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6.3.2.1 Sc(n) for general nonnegative real cth powers |
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193 | (2) |
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6.3.2.2 Nonnegative integer cth powers |
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195 | (1) |
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A A better bound via the Binomial Theorem |
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195 | (2) |
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B Using undetermined coefficients to refine sums |
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197 | (2) |
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C A pictorial solution for c = 2 |
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199 | (2) |
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D Semi-pictorial solutions for c = 3 |
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201 | (6) |
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6.3.2.3 Sc(n) for general negative cth powers |
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207 | (1) |
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A Negative powers -1 < c = 0 |
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207 | (1) |
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208 | (1) |
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C Negative powers c < c = 1: the harmonic series |
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208 | (2) |
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210 | (5) |
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7 The Vertigo of Infinity: Handling the Very Large and the Infinite |
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215 | (18) |
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215 | (6) |
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7.1.1 The Language of Asymptotics |
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216 | (2) |
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7.1.2 The "Uncertainties" in Asymptotic Relationships |
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218 | (2) |
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7.1.3 Inescapable Complications |
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220 | (1) |
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7.2 Reasoning About Infinity |
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221 | (9) |
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7.2.1 Coping with infinity |
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221 | (1) |
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7.2.2 The "Point at Infinity" |
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222 | (1) |
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7.2.2.1 Underspecified problems |
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223 | (1) |
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A Summing ambiguous infinite summations |
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223 | (2) |
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B The Ross-Littlewood paradox |
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225 | (1) |
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C Zeno's paradox: Achilles and the tortoise |
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226 | (1) |
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D Hilbert's hotel paradox |
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227 | (1) |
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7.2.2.2 Foundational paradoxes |
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228 | (1) |
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A Godel's paradox: Self-reference in language |
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228 | (1) |
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B Russell's paradox: The "anti-universal" set |
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229 | (1) |
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230 | (3) |
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8 Numbers II: Building the Integers and Building with the Integers |
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233 | (34) |
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8.1 Prime Numbers: Building Blocks of the Integers |
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233 | (16) |
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8.1.1 The Fundamental Theorem of Arithmetic |
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234 | (1) |
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8.1.1.1 Statement and proof |
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234 | (3) |
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8.1.1.2 A "prime" corollary: There are infinitely many primes |
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237 | (3) |
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8.1.1.3 Number sieves: Eratosthenes and Euler |
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240 | (1) |
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8.1.1.4 Applying the Fundamental Theorem in encryption |
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241 | (1) |
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8.1.1.5 The "density" of the prime numbers |
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242 | (1) |
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8.1.2 Fermat's Little Theorem: aP = a mod p |
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243 | (1) |
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8.1.2.1 A proof that uses "necklaces" |
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243 | (2) |
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8.1.2.2 A proof that uses the Binomial Theorem |
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245 | (1) |
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8.1.3 Perfect Numbers and Mersenne Primes |
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246 | (1) |
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247 | (1) |
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8.1.3.2 Using Mersenne primes to generate perfect numbers |
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248 | (1) |
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8.2 Pairing Functions: Bringing Linear Order to Tuple Spaces |
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249 | (8) |
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8.2.1 Encoding Complex Structures via Ordered Pairs |
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250 | (1) |
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8.2.2 The Diagonal Pairing Function: Encoding N × N+as N+ |
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251 | (3) |
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8.2.3 N × N Is Not "Larger Than" N |
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254 | (1) |
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8.2.3.1 Comparing infinite sets via cardinalities |
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254 | (2) |
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8.2.3.2 Comparing N and N × N via cardinalities |
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256 | (1) |
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8.3 Finite Number Systems |
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257 | (5) |
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8.3.1 Congruences on Nonnegative Integers |
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258 | (1) |
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8.3.2 Finite Number Systems via Modular Arithmetic |
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259 | (1) |
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8.3.2.1 Sums, differences, and products exist within Nq |
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259 | (1) |
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8.3.2.2 Quotients exist within Np for every prime p |
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260 | (2) |
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262 | (5) |
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9 Recurrences: Rendering Complex Structure Manageable |
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267 | (34) |
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268 | (5) |
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9.1.1 The Master Theorem for Simple Linear Recurrences |
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268 | (1) |
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9.1.2 The Master Theorem for General Linear Recurrences |
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269 | (1) |
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9.1.3 An Application: The Elements of Information Theory |
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270 | (3) |
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273 | (13) |
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9.2.1 Binomial Coefficients and Pascal's Triangle |
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273 | (1) |
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9.2.1.1 The formation rule for Pascal's Triangle |
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273 | (1) |
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9.2.1.2 Summing complete rows of Pascal's Triangle |
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274 | (2) |
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9.2.2 The Fibonacci Number Sequence |
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276 | (1) |
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9.2.2.1 The story of the Fibonacci numbers |
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277 | (2) |
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9.2.2.2 Fibonacci numbers and binomial coefficients |
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279 | (1) |
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9.2.2.3 Alternative origins for the Fibonacci sequence |
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280 | (1) |
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A Two multilinear generating recurrences |
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281 | (1) |
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B A family of binary generating recurrences |
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282 | (2) |
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C A combinatorial setting for the sequence |
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284 | (1) |
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9.2.2.4 A closed form for the nth Fibonacci number |
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285 | (1) |
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9.3 Recurrences "in Action": The Token Game |
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286 | (10) |
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286 | (1) |
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9.3.2 An Optimal Strategy for Playing the Game |
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287 | (3) |
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9.3.3 Analyzing the Recursive Strategy |
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290 | (6) |
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296 | (5) |
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10 Numbers III: Operational Representations and Their Consequences |
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301 | (30) |
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10.1 Historical and Conceptual Introduction |
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301 | (3) |
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10.2 Positional Number Systems |
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304 | (5) |
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10.2.1 B-dsy Number Systems |
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305 | (2) |
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10.2.2 A Bijective Number System |
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307 | (2) |
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10.3 Recognizing Integers and Rationals from Their Numerals |
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309 | (7) |
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10.3.1 Positional Numerals for Integers |
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310 | (1) |
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10.3.1.1 Horner's Rule and fast numeral evaluation |
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310 | (2) |
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10.3.1.2 Horner's Rule and fast exponentiation |
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312 | (1) |
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10.3.2 Positional Numerals for Rationals |
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313 | (3) |
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10.4 Sets That Are Uncountable, Hence, "Bigger than" Z and Q |
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316 | (7) |
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10.4.1 The Set of Binary Functions F Is Uncountable |
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317 | (1) |
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10.4.1.1 Plotting a strategy to prove uncountability |
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317 | (1) |
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A Seeking a bijection g: N ↔ F |
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318 | (1) |
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B Every bijection "misses" some function from F |
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319 | (1) |
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10.4.1.2 The denouement: There is no bijection h:N ↔ F |
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319 | (1) |
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319 | (4) |
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323 | (1) |
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10.6 Exercises: Chapter 10 |
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324 | (7) |
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11 The Art of Counting: Combinatorics, with Applications to Probability and Statistics |
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331 | (48) |
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11.1 The Elements of Combinatorics |
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333 | (9) |
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11.1.1 Counting Binary Strings and Power Sets |
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334 | (1) |
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11.1.2 Counting Based on Set Algebra |
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335 | (2) |
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11.1.3 Counting Based on Set Arrangement and Selection |
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337 | (5) |
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11.2 Introducing Combinatorial Probability via Examples |
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342 | (12) |
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11.2.1 The Game of Poker: Counting joint Events |
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343 | (4) |
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11.2.2 The Monty Hall Puzzle: Conditional Probabilities |
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347 | (2) |
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11.2.3 The Birthday Puzzle: Complementary Counting |
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349 | (2) |
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11.2.4 Sum-of-Spots Dice Games: Counting with Complex Events |
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351 | (3) |
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11.3 Probability Functions: Frequencies and Moments |
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354 | (6) |
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11.3.1 Probability Frequency Functions |
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354 | (2) |
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11.3.2 The (Arithmetic) Mean: Expectations |
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356 | (1) |
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11.3.3 Additional Single-Number "Summarizations" |
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357 | (2) |
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11.3.4 Higher Statistical Moments |
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359 | (1) |
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11.4 The Elements of Empirical/Statistical Reasoning |
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360 | (12) |
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11.4.1 Probability Distributions |
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362 | (1) |
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11.4.1.1 The binomial distribution |
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362 | (4) |
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11.4.1.2 Normal distributions; the Central Limit Theorem |
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366 | (2) |
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11.4.1.3 Exponential distributions |
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368 | (1) |
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11.4.2 A Historically Important Observational Experiment |
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369 | (1) |
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11.4.3 The Law of Large Numbers |
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370 | (2) |
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11.5 Exercises: Chapter 11 |
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372 | (7) |
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12 Graphs I: Representing Relationships Mathematically |
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379 | (32) |
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12.1 Generic Graphs: Directed and Undirected |
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380 | (11) |
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12.1.1 The Basics of the World of Graphs |
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380 | (1) |
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12.1.1.1 Locality-related concepts |
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381 | (2) |
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12.1.1.2 Distance-related concepts |
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383 | (2) |
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12.1.1.3 Connectivity-related concepts |
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385 | (1) |
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12.1.2 Graphs as a Modeling Tool: The 2SAT Problem |
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386 | (4) |
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12.1.3 Matchings in Graphs |
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390 | (1) |
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12.2 Trees and Spanning Trees |
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391 | (4) |
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12.3 Computationally Significant "Named" Graphs |
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395 | (14) |
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12.3.1 The Cycle-graph ln |
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396 | (1) |
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12.3.2 The Complete graph (Clique) Hn |
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397 | (2) |
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12.3.3 Sibling Networks: the Mesh (M m,n); the Torus (M m.n) |
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399 | (2) |
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12.3.4 The (Boolean) Hypercube ln |
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401 | (3) |
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12.3.5 The de Bruijn Network dn |
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404 | (5) |
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12.4 Exercises: Chapter 12 |
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409 | (2) |
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13 Graphs II: Graphs for Computing and Communicating |
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411 | (34) |
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13.1 Graph Coloring and Chromatic Number |
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411 | (20) |
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13.1.1 Graphs with Chromatic Number 2 |
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412 | (3) |
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13.1.2 Planar and Outerplanar Graphs |
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415 | (1) |
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13.1.2.1 On 3-coloring outerplanar graphs |
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416 | (4) |
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13.1.2.2 On vertex-coloring planar graphs |
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420 | (1) |
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A On the Four-Color Theorem for planar graphs |
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421 | (1) |
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B The Six-Color Theorem for planar graphs |
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422 | (3) |
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C The Five-Color Theorem for planar graphs |
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425 | (3) |
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13.1.2.3 Two validations of Euler's Formula |
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428 | (3) |
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13.2 Path-and Cycle-Discovery Problems in Graphs |
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431 | (12) |
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13.2.1 Eulerian Cycles and Paths |
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433 | (3) |
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13.2.2 Hamiltonian Paths and Cycles/Tours |
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436 | (1) |
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13.2.2.1 More inclusive notions of Hamiltonicity |
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436 | (1) |
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13.2.2.2 Hamiltonicity in "named" graphs |
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437 | (5) |
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13.2.2.3 Testing general graphs for Hamiltonicity |
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442 | (1) |
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13.3 Exercises: Chapter 13 |
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443 | (2) |
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Appendices: Beyond the Basics |
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445 | (81) |
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A A Cascade of Summations |
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445 | (8) |
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A.1 Revisiting the Triangular Numbers Δ |
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446 | (1) |
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446 | (1) |
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A.2.1 An Algebraic Evaluation of θn |
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446 | (1) |
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A.2.2 A Pictorial Evaluation of θn |
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447 | (2) |
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449 | (1) |
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450 | (3) |
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B Pairing Functions: Encoding N+ × N+ as N+ |
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453 | (8) |
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B.1 A Shell-Based Methodology for Crafting Pairing Functions |
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454 | (1) |
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B.2 The Square-Shell Pairing Function l |
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455 | (1) |
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B.3 The Hyperbolic-Shell Pairing Function H |
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456 | (2) |
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B.4 A Bijective Pairing Using Disjoint Arithmetic Progressions |
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458 | (3) |
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C A Deeper Look at the Fibonacci Numbers |
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461 | (12) |
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C.1 Elementary Computations on Fibonacci Numbers |
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461 | (1) |
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C.1.1 Greatest Common Divisors of Fibonacci Numbers |
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461 | (2) |
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C.1 2 Products of Consecutive Fibonacci Numbers |
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463 | (1) |
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463 | (1) |
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C.2 Computing Fibonacci Numbers Fast |
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464 | (2) |
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C.3 A Number System Based on the Fibonacci Sequence |
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466 | (1) |
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C.3.1 The Foundations of the Number System |
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467 | (1) |
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C.3.1.1 Zeckendorf's Theorem |
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467 | (1) |
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C.3.1.2 Proving Zeckendorf's Theorem |
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467 | (2) |
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C.3.2 Using Zeckendorf Numerals as a Number System |
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469 | (1) |
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C.3.2.1 The system's numerals |
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469 | (1) |
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C.3.2.2 Observations about the system's numerals |
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470 | (1) |
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C.3.2.3 On incrementing Fibonacci numerals |
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471 | (2) |
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D Lucas Numbers: Another Recurrence-Defined Family |
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473 | (6) |
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473 | (1) |
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D.2 Relating the Lucas and Fibonacci Numbers |
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474 | (5) |
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E Signed-Digit Numerals: Carry-Free Addition |
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479 | (4) |
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F The Diverse Delights of de Bruijn Networks |
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483 | (8) |
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F.1 Cycles in de Bruijn Networks |
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483 | (2) |
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F.2 De Bruijn Networks as "Escherian" Trees |
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485 | (6) |
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G Pointers to Applied Studies of Graphs |
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491 | (10) |
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492 | (1) |
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G.2 Graphs Having Evolving Structure |
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493 | (2) |
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495 | (1) |
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G.4 Multigraphs and the Chinese Postman Problem |
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496 | (5) |
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H Solution Sketches for Exercises |
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501 | (24) |
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525 | (1) |
Lists of Symbols |
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526 | (5) |
References |
|
531 | (6) |
Index |
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537 | |