   Chapter 7.4, Problem 17ES ### Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
ISBN: 9781337694193

#### Solutions

Chapter
Section ### Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
ISBN: 9781337694193
Textbook Problem
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# Show that Q, the set of all rational numbers, is dense along the number line by showing that given any two rational line by showing that given any two rational numbers r 1 and r 2 with r 1 < r 2 , there exists a rational number x such that r 1 < x < r 2 .

To determine

To prove:

Along the number line, the set Q of all rational numbers is dense by showing that, for any two rational numbers r1 and r2 with r1<r2, there exists a rational number between two rational numbers r1 and r2.

Explanation

Given information:

Q: The set of rationalnumbers.

Concept used:

The set of rational number is defined as follows.

={pq|p,q and q0}

The set rational number can also be written as ={0}+.

Proof:

Let r1 and r2 be any two rational number on the number line such that r1<r2.

Now show that there exists a rational number between r1 and r2.

The midpoint between any two numbers on the number line is its average.

That means the midpoint for the numbers r1 and r2 on the number line will be their average.

That means midpoint=r1+r22 and it lies exactly middle of the numbers r1 and r2 on the number line.

The number r1+r22 is obviously a rational number and it can be shown as follows.

Let r1=p1q1 where p1,q1 and q10.

Let r2=p2q2 where p2,q2 and q20

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