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Páteří, byť často skrytou, veškeré infinitní matematiky od jejích počátků až do dnešní doby jsou reálná čísla. Také v nové infinitní matematice hrají tato čísla klíčovou roli. Umístili jsme je až na samu hranici antického geometrického světa, kde by měla zachycovat jeho soudržnost a kontinuitu. Tuto hranici pak neklademe až do jakéhosi absolutního nekonečna, ale vykládáme ji jako obzor, i když jen jako obzor geometrický. To nám dovoluje manipulovat jak s touto hranicí, tak s čísly na ní ležícími. Díky tomu lze vhodným posunutím geometrického obzoru provést diskretizaci reálných čísel. To znamená vyložit celou třídu reálných čísel jako podtřídu jisté konečné množiny ležící na vhodném posunutém obzoru.

Numbers, Real. --- Real numbers --- Arithmetic --- Numbers, Complex

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Numbers --- Prime

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Numbers, Prime.

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A superb development that starts with the natural numbers and carries the reader through the rationals and their decimal representations to algebraic numbers and then to the real numbers. Along the way, you will see characterizations of the rationals and of certain special (Liouville) transcendental numbers. This material is basic to all of algebra and analysis. Professor Niven's book may be read with profit by interested high school students as well as by college students and others who want to know more about the basic aspects of pure mathematics.

Numbers, Real. --- Numbers, Rational. --- Irrational numbers. --- Numbers, Complex.

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The classical fields are the real, rational, complex and p-adic numbers. Each of these fields comprises several intimately interwoven algebraical and topological structures. This comprehensive volume analyzes the interaction and interdependencies of these different aspects. The real and rational numbers are examined additionally with respect to their orderings, and these fields are compared to their non-standard counterparts. Typical substructures and quotients, relevant automorphism groups and many counterexamples are described. Also discussed are completion procedures of chains and of ordered and topological groups, with applications to classical fields. The p-adic numbers are placed in the context of general topological fields: absolute values, valuations and the corresponding topologies are studied, and the classification of all locally compact fields and skew fields is presented. Exercises are provided with hints and solutions at the end of the book. An appendix reviews ordinals and cardinals, duality theory of locally compact Abelian groups and various constructions of fields.

Numbers, Real --- Numbers, Rational --- Number theory --- Numbers, Real. --- Numbers, Rational. --- Number theory. --- Number study --- Numbers, Theory of --- Algebra --- Rational numbers --- Real numbers --- Arithmetic --- Numbers, Complex