Prove the completeness axiom directly from the Nested Interval Theorem

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Prove the completeness axiom directly from the Nested Interval Theorem

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Step 1: Introduction

The Completeness Axiom, also known as the Least Upper Bound Property, states that every non-empty subset of real numbers that is bounded from above has a least upper bound (supremum) in the set of real numbers. To prove the Completeness Axiom directly from the Nested Interval Theorem, we need to show that any non-empty set of real numbers that is bounded from above has a least upper bound.

The Nested Interval Theorem, on the other hand, asserts that if we have a sequence of nested closed intervals in the real numbers, i.e., intervals [a₁, b₁] ⊇ [a₂, b₂] ⊇ [a₃, b₃] ⊇ ... such that the length of each interval approaches zero, lim (n → ∞) (bₙ - aₙ) = 0, then there exists a unique real number x that belongs to all these intervals.

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