Determine whether the following sets/elements/functions are ∅-definable in respective structures; prove all your answers. a. The set of non-negative numbers in (ℚ, +). b. The set of non-negative numbers in (ℚ, +, ·). c. The function max(x, y) in (ℝ, <).
Determine whether the following sets/elements/functions are ∅-definable in respective structures; prove all your answers. a. The set of non-negative numbers in (ℚ, +). b. The set of non-negative numbers in (ℚ, +, ·). c. The function max(x, y) in (ℝ, <).
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.7: Relations
Problem 28E
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Determine whether the following sets/elements/functions are ∅-definable in respective structures; prove all your answers.
a. The set of non-negative numbers in (ℚ, +).
b. The set of non-negative numbers in (ℚ, +, ·).
c. The function max(x, y) in (ℝ, <).
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