| Preface | p. xiii |
| Introduction | p. 1 |
| Computably Enumerable Sets | p. 1 |
| Degrees | p. 2 |
| Finite Sequences and Trees | p. 3 |
| Systems Of Trees Of Strategies | p. 5 |
| An Overview | p. 7 |
| Systems of Trees | p. 14 |
| Basic Modules | p. 17 |
| The Path Generating Function | p. 18 |
| Links | p. 21 |
| Consistency | p. 23 |
| Blocks | p. 24 |
| The Weight Function | p. 27 |
| Directing and Action Sentences: An Example | p. 29 |
| Directing and Action Sentences: Properties | p. 31 |
| The Framework Theorem | p. 33 |
| A Sampling of Lemmas | p. 36 |
| ∑1 Construction | p. 41 |
| ∑1Constructions | p. 41 |
| The Friedberg-Mucnik Theorem | p. 47 |
| The Basic R,i-Module | p. 49 |
| T1-Analysis | p. 49 |
| T0-Analysis | p. 49 |
| The Construction | p. 50 |
| The Verification | p. 50 |
| A Low Computably Enumerable Degree | p. 50 |
| The Basic P -Module | p. 51 |
| The Basic NeModule | p. 52 |
| T1-Analysis | p. 52 |
| T0-Analysis | p. 52 |
| The Construction | p. 52 |
| The Verification | p. 52 |
| A Properly d-c.e. Degree | p. 53 |
| The Basic R,, W-Module | p. 54 |
| T1-Analysis | p. 55 |
| T0-Analysis | p. 55 |
| The Construction | p. 56 |
| The Verification | p. 56 |
| Summary | p. 56 |
| 2 Constructions | p. 57 |
| The 2 Level | p. 57 |
| Avoiding Upward Cones | p. 58 |
| The Basic P-Module | p. 59 |
| The Basic N-Module | p. 59 |
| T2-Analysis | p. 60 |
| T1 -Analysis | p. 60 |
| T0-Analysis | p. 60 |
| The Construction | p. 61 |
| The Verification | p. 61 |
| The Sacks Splitting Theorem | p. 61 |
| The Basic Px-Module | p. 62 |
| The Basic N-Module | p. 62 |
| T2-Analysis | p. 63 |
| T1-Analysis | p. 63 |
| T0-Analysis | p. 63 |
| The Construction | p. 64 |
| The Verification | p. 64 |
| Backtracking | p. 64 |
| Permitting | p. 66 |
| The Basic P,i-Module | p. 68 |
| T2-Analysis | p. 69 |
| T1 -Analysis | p. 69 |
| T0Analysis | p. 70 |
| The Construction | p. 70 |
| The Verification | p. 70 |
| Further Remarks | p. 71 |
| Summary | p. 71 |
| 2 Constructions | p. 73 |
| I2 Constructions | p. 73 |
| A High Computably Enumerable Degree | p. 75 |
| The Basic P-Module | p. 76 |
| The Basic Qx-Module | p. 77 |
| T2-Analysis | p. 77 |
| T1-AnalysJs | p. 77 |
| T0-Analysis | p. 78 |
| The Construction | p. 78 |
| The Verification | p. 78 |
| Further Remarks | p. 78 |
| The Jump Inversion Theorem | p. 78 |
| The Basic Qe-Module | p. 80 |
| The Basic Ne-Module | p. 80 |
| T2-Analysis | p. 80 |
| T1-Analysis | p. 80 |
| T0-Analysis | p. 81 |
| The Construction | p. 81 |
| The Verification | p. 81 |
| The Minimal Pair Theorem | p. 81 |
| The Basic P,i-Module | p. 84 |
| The Basic N,-Module | p. 84 |
| T2-Analysis | p. 85 |
| T1-Analysis | p. 85 |
| T0-Analysis | p. 85 |
| The Construction | p. 85 |
| The Verification | p. 86 |
| Further Remarks | p. 86 |
| Embedding the Pentagon | p. 86 |
| The L Requirement | p. 87 |
| The J Requirement | p. 87 |
| The Basic N,-Module | p. 88 |
| The Basic PA,-Module and the Basic PC, -Module | p. 88 |
| The Basic Q-Module | p. 88 |
| T2-Analysis | p. 89 |
| T1-Analysis | p. 89 |
| T0-Analysis | p. 89 |
| The Construction | p. 90 |
| The Verification | p. 90 |
| Further Remarks | p. 90 |
| Summary | p. 91 |
| 3 Constructions | p. 93 |
| 3 Constructions | p. 93 |
| Properties of 3 Constructions | p. 94 |
| The Restraint Requirements | p. 95 |
| The Correction Requirements | p. 96 |
| Bounding A above by V | p. 97 |
| The Density Theorem | p. 98 |
| The R Requirement | p. 98 |
| The Basic N-Module | p. 98 |
| The Basic PModule | p. 99 |
| T3-Analysis | p. 100 |
| T2-Analysis, T^-Analysis | p. 101 |
| T0-Analysis | p. 101 |
| The Construction | p. 101 |
| The Verification | p. 101 |
| Summary | p. 102 |
| 3 Consructions | p. 103 |
| Module-Respecting Derived Assignments | p. 103 |
| Strong Minimal Pairs | p. 104 |
| The Strong Minimal Pair Theorem | p. 106 |
| The Basic P-Module | p. 106 |
| The Basic Q-Module | p. 106 |
| The Basic M,W-Module | p. 107 |
| T3-Analysis..' | p. 108 |
| T2-Analysis | p. 109 |
| T1-Analysis | p. 109 |
| T0-Analysis | p. 110 |
| The Construction | p. 110 |
| The Verification | p. 110 |
| Some Comments | p. 111 |
| Paths and Links | p. 113 |
| Paths | p. 113 |
| Switching and Nonswitching Extensions | p. 117 |
| Links | p. 119 |
| Free Nodes | p. 124 |
| Relationships Between Links | p. 126 |
| Framework Lemmas | p. 132 |
| Monotonic Sentence Decomposition | p. 132 |
| Thrived Assignments | p. 133 |
| Level Analysis Lemmas | p. 136 |
| The 1 Level | p. 136 |
| The 2 Level | p. 137 |
| The 3 Level | p. 138 |
| Restraint Lemmas | p. 140 |
| Miscellaneous Lemmas | p. 144 |
| Backtracking | p. 147 |
| Backtracking | p. 147 |
| Properties of PL Sets | p. 149 |
| Extenders | p. 152 |
| Backtracking and Links | p. 154 |
| Set Approximation | p. 155 |
| Constraint | p. 158 |
| REA Sets | p. 159 |
| Level-Specific Backtracking | p. 161 |
| Higher-Level Constructions | p. 163 |
| Jump Posets with Least Element | p. 163 |
| The Requirements | p. 164 |
| Tl-Analysis | p. 166 |
| Ti-Analysis, I < l | p. 166 |
| The Construction | p. 166 |
| The Construction | p. 167 |
| Proof | p. 168 |
| Infinite Systems of Trees | p. 173 |
| Infinite Systems: A Brief Analysis | p. 173 |
| References | p. 175 |
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