| Preface |
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xix | |
| Acknowledgment |
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xxv | |
| Author Biographies |
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xxvii | |
| 1 Introduction |
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1 | (30) |
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1.1 Historical Overview and Earliest Results |
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1 | (9) |
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1.2 Timeline of Research for Set Partitions |
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10 | (10) |
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20 | (7) |
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20 | (1) |
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1.3.2 Statistics on Set Partitions |
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21 | (2) |
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1.3.3 Pattern Avoidance in Set Partitions |
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23 | (2) |
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1.3.4 Restricted Set Partitions |
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25 | (1) |
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1.3.5 Asymptotics Results on Set Partitions |
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25 | (1) |
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1.3.6 Generating Set Partitions |
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26 | (1) |
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1.3.7 Normal Ordering and Set Partitions |
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27 | (1) |
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27 | (4) |
| 2 Basic Tools of the Book |
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31 | (44) |
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31 | (8) |
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2.2 Solving Recurrence Relations |
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39 | (6) |
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39 | (1) |
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40 | (1) |
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2.2.3 Characteristic Polynomial |
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40 | (5) |
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45 | (18) |
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2.4 Lagrange Inversion Formula |
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63 | (1) |
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2.5 The Principle of Inclusion and Exclusion |
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64 | (3) |
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67 | (4) |
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71 | (4) |
| 3 Preliminary Results on Set Partitions |
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75 | (32) |
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75 | (9) |
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3.2 Different Representations |
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84 | (15) |
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3.2.1 Block Representation |
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85 | (4) |
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3.2.2 Circular Representation and Line Diagram |
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89 | (1) |
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3.2.3 Flattened Set Partitions |
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90 | (5) |
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3.2.4 More Representations |
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95 | (14) |
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3.2.4.1 Canonical Representation |
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95 | (1) |
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3.2.4.2 Graphical Representation |
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96 | (1) |
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3.2.4.3 Standard Representation |
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96 | (2) |
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3.2.4.4 Rook Placement Representation |
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98 | (1) |
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99 | (4) |
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3.4 Research Directions and Open Problems |
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103 | (4) |
| 4 Subword Statistics on Set Partitions |
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107 | (58) |
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4.1 Subword Patterns of Size Two: Rises, Levels and Descents |
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109 | (10) |
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114 | (3) |
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4.1.2 Nontrivial Rises and Descents |
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117 | (2) |
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119 | (12) |
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4.2.1 Counting Peaks in Words |
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120 | (3) |
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123 | (3) |
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126 | (5) |
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4.3 Subword Patterns: l-Rises, l-Levels, and l-Descents |
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131 | (10) |
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131 | |
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130 | (9) |
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4.3.3 Long-Descent. Pattern |
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139 | (2) |
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4.4 Families of Subword Patterns |
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141 | (11) |
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4.4.1 The Patterns 122...2, 11...12 |
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141 | (2) |
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4.4.2 The Patterns 22...21, 211...1 |
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143 | (3) |
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146 | (2) |
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4.4.4 The Pattern mp(m+1) |
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148 | (3) |
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4.4.5 The Pattern (m+1)pm |
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151 | (1) |
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4.5 Patterns of Size Three |
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152 | (6) |
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158 | (1) |
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4.7 Research Directions and Open Problems |
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159 | (6) |
| 5 Nonsubword Statistics on Set Partitions |
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165 | (58) |
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5.1 Statistics and Block Representation |
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167 | (2) |
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5.2 Statistics and Canonical and Rook Representations |
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169 | (6) |
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5.3 Records and Weak Records |
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175 | (7) |
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176 | (3) |
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5.3.2 Sum of Positions of Records |
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179 | (2) |
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5.3.3 Sum of Positions of Additional Weak Records |
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181 | (1) |
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5.4 Number of Positions Between Adjacent Occurrences of a Letter |
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182 | (14) |
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185 | (5) |
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5.4.2 The Statistic m-Distance |
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190 | (3) |
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5.4.3 Combinatorial Proofs |
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193 | (3) |
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5.5 The Internal Statistic |
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196 | (6) |
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198 | (2) |
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200 | (2) |
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5.6 Statistics and Generalized Patterns |
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202 | (7) |
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209 | (6) |
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5.8 Number of Crossings, Nestings and Alignments |
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215 | (1) |
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216 | (3) |
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5.10 Research Directions and Open Problems |
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219 | (4) |
| 6 Avoidance of Patterns in Set Partitions |
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223 | (84) |
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6.1 History and Connections |
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223 | (2) |
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6.2 Avoidance of Subsequence Patterns |
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225 | (50) |
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6.2.1 Pattern-Avoiding Fillings of Diagrams |
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226 | (10) |
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6.2.2 Basic Facts and Patterns of Size Three |
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236 | (1) |
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6.2.3 Noncrossing and Nonnesting Set Partitions |
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237 | (2) |
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6.2.4 The Patterns 12...(k + 1)12...k, 12...k12...(k + 1) |
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239 | (4) |
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6.2.4.1 The Pattern 12...(k+1)12...k |
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240 | (1) |
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6.2.4.2 The Pattern 12...k12...(k+1) |
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241 | (1) |
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242 | (1) |
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6.2.5 Patterns of the Form 1(τ + 1) |
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243 | (1) |
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6.2.6 The Patterns 12...k1, 12...k12 |
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244 | (6) |
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6.2.7 Patterns Equivalent to 12k...m |
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250 | (1) |
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250 | (6) |
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6.2.9 Patterns Equivalent to 12k13 |
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256 | (3) |
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6.2.10 Landscape Patterns |
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259 | (5) |
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6.2.11 Patterns of Size Four |
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264 | (4) |
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6.2.11.1 The Pattern 1123 |
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264 | (3) |
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6.2.11.2 Classification of Patterns of Size Four |
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267 | (1) |
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6.2.12 Patterns of Size Five |
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268 | (2) |
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6.2.12.1 The Equivalence 12112 ~ 12212 |
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268 | (2) |
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6.2.12.2 Classification of Patterns of Size Five |
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270 | (1) |
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6.2.13 Patterns of Size Six |
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270 | (2) |
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6.2.14 Patterns of Size Seven |
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272 | (3) |
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275 | (14) |
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6.3.1 Patterns of Type (1, 2) |
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276 | (4) |
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6.3.2 Patterns of Type (2, 1) |
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280 | (9) |
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6.4 Partially Ordered Patterns |
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289 | (9) |
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6.4.1 Patterns of Size Three |
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290 | (4) |
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294 | (4) |
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298 | (2) |
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6.6 Research Directions and Open Problems |
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300 | (7) |
| 7 Multi Restrictions on Set Partitions |
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307 | (72) |
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7.1 Avoiding a Pattern of Size Three and Another Pattern |
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308 | (7) |
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7.1.1 The Patterns 112,121 |
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309 | (3) |
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312 | (2) |
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314 | (1) |
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7.2 Pattern Avoidance in Noncrossing Set Partitions |
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315 | (12) |
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320 | (2) |
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7.2.2 Generating Functions |
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322 | (4) |
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7.2.3 CC-Equivalences of Patterns of Size Four |
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326 | (1) |
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7.2.4 CC-Equivalences of Patterns of Size Five |
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326 | (1) |
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327 | (3) |
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7.4 Two Patterns of Size Four |
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330 | (4) |
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334 | (5) |
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7.5.1 The Pairs (1222, 1212) and (1112, 1212) |
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335 | (1) |
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7.5.2 The Pair (1211,1221) |
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336 | (1) |
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7.5.3 The Pair (1222, 1221) |
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337 | (2) |
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339 | (7) |
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7.6.1 The Pairs (1212, 12221), (1212, 11222), (1212, 11122) |
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340 | (1) |
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7.6.2 The Pair (1221, 12311) |
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340 | (2) |
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7.6.3 The Pairs (1221,12112), (1221, 12122) |
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342 | (4) |
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7.7 Catalan and Generalized Catalan Numbers |
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346 | (1) |
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347 | (7) |
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7.8.1 Counting Pn(1211, 1212, 1213) by inv |
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348 | (3) |
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7.8.2 Counting Pn(1212, 1222, 1232) by Comaj |
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351 | (3) |
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7.9 Regular Set Partitions |
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354 | (5) |
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7.9.1 Noncrossing Regular Set Partitions |
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357 | (1) |
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7.9.2 Nonnesting Regular Set Partitions |
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358 | (1) |
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7.10 Distance Restrictions |
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359 | (3) |
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362 | (2) |
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364 | (3) |
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367 | (5) |
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7.14 Research Directions and Open Problems |
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372 | (7) |
| 8 Asymptotics and Random Set Partition |
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379 | (44) |
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8.1 Tools from Probability Theory |
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380 | (7) |
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8.2 Tools from Complex Analysis |
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387 | (7) |
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394 | (7) |
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8.4 Set Partitions as Geometric Words |
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401 | (4) |
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8.5 Asymptotics for Set Partitions |
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405 | (13) |
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8.5.1 Asymptotics for Bell and Stirling Numbers |
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405 | (11) |
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8.5.1.1 On the Number of Blocks |
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409 | (2) |
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8.5.1.2 On the Number of Distinct Block Sizes |
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411 | (5) |
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8.5.2 On Number of Blocks in a Noncrossing Set Partition |
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416 | (1) |
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417 | (1) |
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418 | (2) |
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8.7 Research Directions and Open Problems |
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420 | (3) |
| 9 Gray Codes, Loopless Algorithms and Set Partitions |
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423 | (16) |
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9.1 Gray Code and Loopless Algorithms |
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424 | (4) |
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428 | (6) |
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9.3 Loopless Algorithm for Generating |
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434 | (2) |
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436 | (1) |
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9.5 Research Directions and Open Problems |
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437 | (2) |
| 10 Set Partitions and Normal Ordering |
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439 | (34) |
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440 | (6) |
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10.2 Linear Representation and N((a†a)n) |
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446 | (3) |
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10.3 Wick's Theorem and q-Normal Ordering |
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449 | (3) |
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452 | (5) |
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10.5 Noncrossing Normal Ordering |
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457 | (12) |
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10.5.1 Some Preliminary Observations |
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459 | (1) |
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10.5.2 Noncrossing Normal Ordering of (ar(a†)s)n |
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460 | (2) |
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10.5.3 Noncrossing Normal Ordering of (ar+(a†)s)n |
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462 | (3) |
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10.5.4 k-Ary Trees and Lattice Paths |
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465 | (4) |
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469 | (2) |
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10.7 Research Directions and Open Problems |
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471 | (2) |
| A Solutions and Hints |
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473 | (28) |
| B Identities |
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501 | (2) |
| C Power Series and Binomial Theorem |
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503 | (4) |
| D Chebychev Polynomials of the Second Kind |
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507 | (4) |
| E Linear Algebra and Algebra Review |
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511 | (2) |
| F Complex Analysis Review |
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513 | (4) |
| G Coherent States |
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517 | (2) |
| H C++ Programming |
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519 | (18) |
| I Tables |
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537 | (6) |
| J Notation |
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543 | (4) |
| Bibliography |
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547 | (26) |
| Index |
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573 | |