Textbook in PDF format Part 1 begins with an overview of properties of the real numbers and starts to introduce the notions of set theory. The absolute value and in particular inequalities are considered in great detail before functions and their basic properties are handled. From this the authors move to differential and integral calculus. Many examples are discussed. Proofs not depending on a deeper understanding of the completeness of the real numbers are provided. As a typical calculus module, this part is thought as an interface from school to university analysis. Part 2 returns to the structure of the real numbers, most of all to the problem of their completeness which is discussed in great depth. Once the completeness of the real line is settled the authors revisit the main results of Part 1 and provide complete proofs. Moreover they develop differential and integral calculus on a rigorous basis much further by discussing uniform convergence and the interchanging of limits, infinite series (including Taylor series) and infinite products, improper integrals and the gamma function. In addition they discussed in more detail as usual monotone and convex functions. Finally, the authors supply a number of Appendices, among them Appendices on basic mathematical logic, more on set theory, the Peano axioms and mathematical induction, and on further discussions of the completeness of the real numbers. Remarkably, Volume I contains ca. 360 problems with complete, detailed solutions. Acknowledgements and Apologies List of Symbols The Greek Alphabet Introductory Calculus Numbers - Revision The Absolute Value, Inequalities and Intervals Mathematical Induction Functions and Mappings Functions and Mappings Continued Derivatives Derivatives Continued The Derivative as a Tool to Investigate Functions The Exponential and Logarithmic Functions Trigonometric Functions and Their Inverses Investigating Functions Integrating Functions Rules for Integration Analysis in One Dimension Problems with the Real Line Sequences and their Limits A First Encounter with Series The Completeness of the Real Numbers Convergence Criteria for Series, b-adic Fractions 243 Point Sets in R Continuous Functions Differentiation Applications of the Derivative Convex Functions and some Norms on Rn Uniform Convergence and Interchanging Limits The Riemann Integral The Fundamental Theorem of Calculus A First Encounter with Differential Equations Improper Integrals and the Γ-Function Power Series and Taylor Series Infinite Products and the Gauss Integral More on the Γ-Function Selected Topics on Functions of a Real Variable Appendices Elementary Aspects of Mathematical Logic Sets and Mappings. A Collection of Formulae The Peano Axioms Results from Elementary Geometry Trigonometric and Hyperbolic Functions More on the Completeness of R Limes Superior and Limes Inferior Connected Sets in R Solutions to Problems of Part 1 Solutions to Problems of Part 2 References Mathematicians Contributing to Analysis Subject Index