Problem 4 Let A be a set, and let R be a relation on A. 1. Suppose R is reflexive. Prove that ∪x∈A[x] = A. 2. Suppose R is symmetric. Prove that x ∈[y] if and only if y ∈[x], for all x, y ∈A. 3. Suppose R is transitive. Prove that if xRy, then [y] ⊆[x] for all x, y ∈A.
Problem 4 Let A be a set, and let R be a relation on A. 1. Suppose R is reflexive. Prove that ∪x∈A[x] = A. 2. Suppose R is symmetric. Prove that x ∈[y] if and only if y ∈[x], for all x, y ∈A. 3. Suppose R is transitive. Prove that if xRy, then [y] ⊆[x] for all x, y ∈A.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.7: Relations
Problem 6TFE: Label each of the following statements as either true or false. Let R be a relation on a nonempty...
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Problem 4
Let A be a set, and let R be a relation on A.
1. Suppose R is reflexive. Prove that ∪x∈A[x] = A.
2. Suppose R is symmetric. Prove that x ∈[y] if and only if y ∈[x], for all x, y ∈A.
3. Suppose R is transitive. Prove that if xRy, then [y] ⊆[x] for all x, y ∈A.
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