| PREFACE |
| FROM THE PREFACE TO THE ORIGINAL EDITION |
| FIRST PART ELEMENTS OF LOGIC. DEDUCTIVE METHOD |
| I. ON THE USE OF VARIABLES |
| 1. Constants and variables |
| 2. Expressions containing variables-sentential and designatory functions |
| 3. Formation of sentences by means of variables-universal and existential sentences |
| 4. Universal and existential quantifiers; free and bound variables |
| 5. The importance of variables in mathematics |
| Exercises |
| II. ON THE SENTENTIAL CALCULUS |
| 6. Logical constants; the old logic and the new logic |
| 7. "Sentential calculus; negation of a sentence, conjunction and disjunction of sentences" |
| 8. Implication or conditional sentence; implication in material meaning |
| 9. The use of implication in mathematics |
| 10. Equivalence of sentences |
| 11. The formulation of definitions and its rules |
| 12. Laws of sentential calculus |
| 13. Symbolism of sentential calculus; truth functions and truth tables |
| 14. Application of laws of sentential calculus in inference |
| 15. "Rules of inference, complete proofs" |
| Exercises |
| III. ON THE THEORY OF IDENTITY |
| 16. Logical concepts outside sentential calculus; concept of identity |
| 17. Fundamental laws of the theory of identity |
| 18. Identity of things and identity of their designations; use of quotation marks |
| 19. "Equality in arithmetic and geometry, and its relation to logical identity" |
| 20. Numerical quantifiers |
| Exercises |
| IV. ON THE THEORY OF CLASSES |
| 21. Classes and their elements |
| 22. Classes and sentential functions with one free variable |
| 23. Universal class and null class |
| 24. Fundamental relations among classes |
| 25. Operations on classes |
| 26. "Equinumerous classes, cardinal number of a class, finite and infinite classes; arithmetic as a part of logic" |
| Exercises |
| V. ON THE THEORY OF RELATIONS |
| 27. "Relations, their domains and counter-domains; relations and sentential functions with two free variables" |
| 28. Calculus of relations |
| 29. Some properties of relations |
| 30 "Relations which are reflexive, symmetrical and transitive" |
| 31. Ordering relations; examples of other relations |
| 32. One-many relations or functions |
| 33. "One-one relations or biunique functions, and one-to-one correspondences" |
| 34. Many-termed relations; functions of several variables and operations |
| 35. The importance of logic for other sciences |
| Exercises |
| VI. ON THE DEDUCTIVE METHOD |
| 36. "Fundamental constituents of a deductive theory-primitive and defined terms, axioms and theorems" |
| 37. Model and interpretation of a deductive theory |
| 38. Law of deduction; formal character of deductive sci |
| 39. Selection of axioms and primitive terms; their independence |
| 40. "Formalization of definitions and proofs, formalized deductive theories" |
| 41. Consistency and completeness of a deductive theory; decision problem |
| 42. The widened conception of the methodology of deductive sciences |
| Exercises |
| SECOND PART APPLICATIONS OF LOGIC AND METHODOLOGY IN CONSTRUCTING MATHEMATICAL THEORIES |
| VII. CONSTRUCTION OF A MATHEMATICAL THEORY: LAWS OF ORDER FOR NUMBERS |
| 43. Primitive terms of the theory under construction; axioms concerning fundamental relations among numbers |
| 44. Laws of irreflexivity for the fundamental relations; indirect proofs |
| 45. Further theorems on the fundamental relations |
| 46. Other relations among numbers |
| Exercises |
| VIII. CONSTRUCTION OF A MATHEMATICAL THEORY: LAWS OF ADDITION AND SUBTRACTION |
| 47. "Axioms concerning addition; general properties of operations, concepts of a group and of an Abelian group" |
| 48. Commutative and associative laws for a larger number of summands |
| 49. Laws of monotony for addition and their converses |
| 50. Closed systems of sentences |
| 51. Consequences of the laws of monotony |
| 52. Definition of subtraction; inverse operations |
| 53. Definitions whose definiendum contains the identity sign |
| 54. Theorems on subtraction |
| Exercises |
| IX. METHODOLOGICAL CONSIDERATIONS ON THE CONSTRUCTED THEORY |
| 55. Elimination of superfluous axioms in the original axiom system |
| 56. Independence of the axioms of the simplified system |
| 57. Elimination of superfluous primitive terms and subsequent simplification of the axiom system; concept of an ordered Abelian group |
| 58. Further simplification of the axiom system; possible transformations of the system of primitive terms |
| 59. Problem of the consistency of the constructed theory |
| 60. Problem of the completeness of the constructed theory |
| Exercises |
| X. EXTENSION OF THE CONSTRUCTED THEORY. FOUNDATIONS OF ARITHMETIC OF REAL NUMBERS |
| 61. First axiom system for the arithmetic of real numbers |
| 62. Closer characterization of the first axiom system; its methodological advantages and didactical disadvantages |
| 63. Second axiom system for the arithmetic of real numbers |
| 64. Closer characterization of the second axiom system; concepts of a field and of an ordered field |
| 65. Equipollence of the two axiom systems; methodological disadvantages and didactical advantages of the second system |
| Exercises |
| SUGGESTED READINGS |
| INDEX |