Preface
This book is about different types of numbers. Counting process starts with positive whole numbers, known as natural numbers. The system is extended to have the negative whole numbers and zero in it. It is further extended to rational numbers, followed by real numbers, and ultimately by complex numbers. For natural numbers, integers, and rational numbers, before going for the formal study, we have started with real-life problems and introduced the basis of formal definition with real-life problems.
The formal study of the system has references to some topics in mathematics. For the sake of completeness, we have included a brief introduction of these topics in Chapter 1 [1–3]. We have started with set theory. Set theory starts with an ...
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