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Preface; Explanation of Conventions Chapter 1. Introduction 1. The nature of mathematical logic 2. The logical antinomies 3. The nature of mathematics 4. Mathematics and logic 5. Supplementary topics Chapter 2. Formal Systems 1. Preliminaries 2. Theories 3. Systems 4. Special forms of systems 5. Algorithms 6. Supplementary topics Chapter 3. Epitheory 1. The nature of epitheory 2. Replacement and monotone relations 3. The theory of definition 4. Variables 5. Supplementary topics Chapter 4. Relational logical algebra 1. Logical algebras in general 2. Lattices 3. Skolem lattices 4. Classical Skolem lattices 5. Supplementary topics Chapter 5. The Theory of Implication 1. General principles of assertional logical algebra 2. Propositional algebras 3. The systems LA and LC 4. Equivalence of the systems 5. L deducibility 6. Supplementary topics Chapter 6. Negation 1. The nature of negation 2. L systems for negation 3. Other formulations of negation 4. Technique of classical negation 5. Supplementary topics Chapter 7. Quantification 1. Formulation 2. Theory of the L systems 3. Other forms of quantification theory 4. Classical epitheory 5. Supplementary topics Chapter 8. Modality 1. Formulation of necessity 2. The L theory of necessity 3. The T and H formulations of necessity 4. Supplementary topics Bibliography; Index