Introduction ix
Chapter 1. Graphs 1
1.1. Graph theory: a brief history 1
1.2. Basic definitions 6
1.3. Different types of graphs 6
1.4. More on the list of graphs 9
1.5. Graphs and vertices 11
1.6. Some operations on graphs 13
1.7. Graph isomorphisms 15
1.7.1. Self-complementary graphs 15
1.7.2. Properties of self-complementary graphs 16
1.8. Symmetric and asymmetric graphs 17
1.9. Extremal graphs 20
1.10. Independence, non-separability, reconstruction conjecture 23
Chapter 2. Philosophical Graphs 29
2.1. Ancient mappings 29
2.2. Chinese tetragrams 33
2.3. Pythagorism and pentagram 33
2.4. n-grams and some figures of the world 35
2.5. Graphs and classical systematicity 41
2.6. Towards a new kind of systematicity 52
2.6.1. Non-Hamiltonian and non-Eulerian philosophies 52
2.6.2. Pancyclic graphs and Metahegelianism 57
2.7. Non-pythagorism and arrangement of lines 58
2.7.1. Levi graphs of line arrangements 62
2.7.2. Line arrangements of curve lines 65
2.7.3. Hyperbolic graphs 67
Chapter 3. Order and Its Philosophical Use 73
3.1. The mathematical notion of order: a brief history 74
3.2. The idea of âwell-orderingâ 76
3.3. Quasiorders (or preorders) 79
3.4. Partial orders 81
3.4.1. The notion of well partial order 84
3.4.2. Linear extension of a poset 84
3.4.3. Well partially orderings 85
3.5. Trees 85
3.5.1. A zoo of infinite trees 86
3.5.2. Ordinal infinite classifications 87
3.6. Moral problems in a finite world 87
3.7. Order versus circularity 92
3.8. Conclusion 96
Chapter 4. Towards a Formal Philosophy 99
4.1. Asenjoâs systems and Dubarleâs formalization of Hegelianism 99
4.1.1. Asenjoâs systems and Dubarleâs case 100
4.1.2. Dubarle, Parmenidesâ thought and Hegel 102
4.1.3. Projective algebras 103
4.2. Some criticisms 106
4.3. Porphyry and the neoplatonist mode of thought 107
4.4. A variant of Dubarleâs formalism 109
4.5. Quasi-Hegelian systems 112
4.6. Philosophical thinking and finite projective geometry 114
4.7. Other algebras for philosophical thinking 116
4.8. Models derived from geometry and algebraic geometry 117
4.9. Conclusion 120
Chapter 5. Philosophical Transformations 121
5.1. The paradox of a metasystem 121
5.2. In search of an algebra 137
Chapter 6. Concepts and Topology 141
6.1. Formal concepts 141
6.2. Fuzzy concepts 143
6.3. The case of philosophical concepts 144
Chapter 7. The Problem of the Infinite 155
7.1. The arithmetic of infinite cardinals 156
7.2. The question of large cardinals 158
7.3. Woodinâs program 163
7.3.1. Woodin I: CH would be false 163
7.3.2. Woodin II: CH may be true 165
7.3.3. Ultimate L and CH 167
7.4. Infinite and philosophy 167
Chapter 8. In Search for a New Philosophy 171
8.1. The finite case 171
8.2. The infinite case 176
Chapter 9. Extension of Structuralism and Negative Theology 181
9.1. Complementarity graphs 182
9.2. Order relation, ordered set 184
9.3. Graphs associated with a partially ordered set 185
9.4. Complementarity and incomparability graphs of a poset 187
9.5. Boolean representation of a poset 187
9.6. Case of lattices 189
9.6.1. Case of Boolean lattices 191
9.6.2. Generalization: Boolean lattices as n-cubes 193
9.7. Consequences for negative theology 196
Chapter 10. From Fuzzy Graphs to Neutrosophic Graphs 201
10.1. Fuzzy sets 201
10.2. Fuzzy graphs 204
10.3. Intuitionistic fuzzy set theory 206
10.4. Neutrosophy 208
10.5. Single-valued neutrosophic sets and graphs 211
Conclusion 215
References 221
Index 235
