# Solved: Prove that the set of positive rational numbers is

## Problem 56E Chapter 4.3

Discrete Mathematics and Its Applications | 7th Edition

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Problem 56E

Prove that the set of positive rational numbers is countable by setting up a function that assigns to a rational number p/q with gcd(p, q) = 1 the base 11 number formed by the decimal representation of p followed by the base 11 digit A, which corresponds to the decimal number 10, followed by the decimal representation of q.

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Psych 2300: Psychology Research Methods 6/15 & 6/17 Four Validities - Validity: appropriateness of a conclusion or decision Construct Validity  Operationalization of a variable  Applies to all claims  Is this a reasonable way of quantifying what I want to understand  Assessing creativity  measure x : is x a reasonable way to measure creativity...

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Solved: Prove that the set of positive rational numbers is

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