| Preface | 7 |
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| Contents | 11 |
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| 1 The Concept of Symmetry | 15 |
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| 1.1 The Essence of Symmetry | 15 |
| 1.2 Symmetry Implies Asymmetry | 22 |
| 1.3 Analogy and Classi.cation Are Symmetry | 24 |
| 1.4 Summary | 29 |
| 2 Science Is Founded on Symmetry | 30 |
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| 2.1 Science | 30 |
| 2.2 Reduction Is Symmetry | 33 |
| 2.3 Reproducibility Is Symmetry | 42 |
| 2.4 Predictability Is Symmetry | 45 |
| 2.5 Analogy in Science | 48 |
| 2.6 Symmetry at the Foundation of Science | 50 |
| 2.7 Summary | 51 |
| 3 Symmetry in Physics | 52 |
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| 3.1 Symmetry of Evolution | 53 |
| 3.2 Symmetry of States | 57 |
| 3.3 Reference Frame | 62 |
| 3.4 Global, Inertial, and Local Reference Frames | 66 |
| 3.5 Gauge Transformation | 68 |
| 3.6 Gauge Symmetry | 71 |
| 3.7 Symmetry and Conservation | 78 |
| 3.8 Symmetry at the Foundation of Physics | 83 |
| 3.9 Symmetry at the Foundation of Quantum Theory | 84 |
| 3.10 Summary | 90 |
| 4 The Symmetry Principle | 93 |
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| 4.1 Causal Relation | 93 |
| 4.2 Equivalence Relation, Equivalence Class | 98 |
| 4.3 The Equivalence Principle | 101 |
| 4.4 The Symmetry Principle | 109 |
| 4.5 Cause and E.ect in Quantum Systems | 114 |
| 4.6 Summary | 116 |
| 5 Application of Symmetry | 118 |
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| 5.1 Minimalistic Use of the Symmetry Principle | 118 |
| 5.2 Maximalistic Use of the Symmetry Principle | 136 |
| 5.3 Summary | 141 |
| 6 Approximate Symmetry, Spontaneous Symmetry Breaking | 142 |
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| 6.1 Approximate Symmetry | 142 |
| 6.2 Spontaneous Symmetry Breaking | 146 |
| 6.3 Summary | 151 |
| 7 Cosmic Considerations | 152 |
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| 7.1 Symmetry of the Laws of Nature | 152 |
| 7.2 Symmetry of the Universe | 155 |
| 7.3 No Cosmic Symmetry Breaking or Restoration | 158 |
| 7.4 The Quantum Era and The Beginning | 166 |
| 7.5 Summary | 170 |
| 8 The Mathematics of Symmetry: Group Theory | 172 |
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| 8.1 Group | 172 |
| 8.2 Mapping | 187 |
| 8.3 Isomorphism | 191 |
| 8.4 Homomorphism | 197 |
| 8.5 Subgroup | 203 |
| 8.6 Summary | 205 |
| 9 Group Theory Continued | 206 |
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| 9.1 Conjugacy, Invariant Subgroup, Kernel | 206 |
| 9.2 Coset Decomposition | 214 |
| 9.3 Factor Group | 218 |
| 9.4 Anatomy of Homomorphism | 220 |
| 9.5 Generator | 226 |
| 9.6 Direct Product | 228 |
| 9.7 Permutation, Symmetric Group | 231 |
| 9.8 Cayley s Theorem | 235 |
| 9.9 Summary | 237 |
| 10 The Formalism of Symmetry | 238 |
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| 10.1 System, State | 238 |
| 10.2 Transformation, Transformation Group | 240 |
| 10.3 Transformations in Space, Time, and Space-Time | 247 |
| 10.4 State Equivalence | 251 |
| 10.5 Symmetry Transformation, Symmetry Group | 254 |
| 10.6 Approximate Symmetry Transformation | 262 |
| 10.7 Quanti.cation of Symmetry | 264 |
| 10.8 Quantum Systems | 266 |
| 10.9 Summary | 269 |
| 11 Symmetry in Processes | 271 |
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| 11.1 Symmetry of the Laws of Nature | 271 |
| 11.2 Symmetry of Initial and Final States, the General Symmetry Evolution Principle | 280 |
| 11.3 The Special Symmetry Evolution Principle and Entropy | 284 |
| 11.4 Summary | 290 |
| 12 Summary of Principles | 292 |
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| 12.1 Symmetry and Asymmetry | 292 |
| 12.2 Symmetry Implies Asymmetry | 292 |
| 12.3 No Exact Symmetry of the Universe | 293 |
| 12.4 Cosmological Implications | 294 |
| 12.5 The Equivalence Principle | 294 |
| 12.6 The Symmetry Principle | 294 |
| 12.7 The Equivalence Principle for Processes | 295 |
| 12.8 The Symmetry Principle for Processes | 295 |
| 12.9 The General Symmetry Evolution Principle | 295 |
| 12.10 The Special Symmetry Evolution Principle | 295 |
| References | 297 |
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| Index | 304 |