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I. Continuity and Irrational Numbers Preface 1. Properties of Rational Numbers 2. Comparison of the Rational Numbers with the Points of a Straight Line 3. Continuity of the Straight Line 4. Creation of Irrational Numbers 5. Continuity of the Domain of Real Numbers 6. Operations with Real Numbers 7. Infinitesimal Analysis II. The Nature and Meaning of Numbers Prefaces 1. Systems of Elements 2. Transformation of a System 3. Similarity of a Transformation. Similar Systems 4. Transformation of a System in Itself 5. The Finite and Infinite 6. Simply Infinite Systems. Series of Natural Numbers 7. Greater and Less Numbers 8. Finite and Infinite Parts of the Number-Series 9. Definition of a Transformation of the Number-Series by Induction 10. The Class of Simply Infinite Systems 11. Addition of Numbers 12. Multiplication of Numbers 13. Involution of Numbers 14. Number of the Elements of a Finite System