Real Functions in One Variable
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 Price: 129.00 kr
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About the book
Description
This series consists of six book on the elementary part of the theory of real functions in one variable. It is basic in the sense that Mathematics is the language of Physics. The emhasis is laid on worked exammples, while the mathematical theory is only briefly sketched, almost without proofs. The reader is referred to the usual textbooks. The most commonly used formulæ are included in each book as a separate appendix.
Preface
The publisher recently asked me to write an overview of the most common subjects in a first course of Calculus at university level. I have been very pleased by this request, although the task has been far from easy.
Since most students already have their recommended textbook, I decided instead to write this contribution in a totally different style, not bothering too much with rigoristic assumptions and proofs. The purpose was to explain the main ideas and to give some warnings at places where students traditionally make errors.
By rereading traditional textbooks from the first course of Calculus I realized that since I was not bound to a strict logical structure of the contents, always thinking of the students’ ability at that particular stage of the text, I could give some additional results which may be useful for the reader. These extra results cannot be given in normal textbooks without violating their general idea. This has actually been great fun to me, and I hope that the reader will find these additions useful. At the same time most of the usual stuff in these initial courses in Calculus has been treated.
When emphasizing formulæ I had the choice of putting them into a box, or just give them a number. I have chose the latter, because too many boxes would overwhelm the reader. On the other hand, I had sometimes also to number less important formulæ because there are local references to them. I hope that the reader can distinguish between these two applications of the numbering.
In the Appendix I have collected some useful formulæ, which the reader may use for references.
It should be emphasized that this is not an ordinary textbook, but instead a supplement to existing ones, hopefully giving some new ideas in how problems in Calculus can be solved.
It is impossible to avoid errors in any book, so even if I have done my best to correct them, I would not dare to claim that I have got rid of all of them. If the reader unfortunately should use a formula or result which has been wrongly put here (misprint or something missing) I do hope that my sins will be forgiven.
Leif Mejlbro
Content
 Complex Numbers
 Introduction
 Definition
 Rectangular description in the Euclidean plane
 Description of complex numbers in polar coordinates
 Algebraic operations in rectangular coordinates
 The complex exponential function
 Algebraic operations in polar coordinates
 Roots in polynomials
 The Elementary Functions
 Introduction
 Inverse functions
 Logarithms and exponentials
 Power functions
 Trigonometric functions
 Hyperbolic functions
 Area functions
 Arcus functions
 Magnitude of functions
 Differentiation
 Introduction
 Definition and geometrical interpretation
 A catalogue of known derivatives
 The simple rules of calculation
 Differentiation of composite functions
 Differentiation of an implicit given function
 Differentiation of an inverse function
 Integration
 Introduction
 A catalogue of standard antiderivatives
 Simple rules of integration
 Integration by substitution
 Complex decomposition of fractions of polynomials
 Integration of a fraction of two polynomials
 Integration of trigonometric polynomials
 Simple Differential Equations
 Introduction
 Differential equations which can be solved by separation
 The linear differential equation of first order
 Linear differential equations of constant coefficients
 Euler’s differential equation
 Linear differential equations of second order with variable coefficients
 Approximations of Functions
 Introduction
 e  functions
 Taylor’s formula
 Taylor expansions of standard functions
 Limits
 Asymptotes
 Approximations of integrals
 Miscellaneous applications
 Formulæ
 Squares etc.
 Powers etc.
 Differentiation
 Special derivatives
 Integration
 Special antiderivatives
 Trigonometric formulæ
 Hyperbolic formulæ
 Complex transformation formulæ
 Taylor expansions
 Magnitudes of functions