Let /: X →Y be a function, A, BC X and C, DCY. Show that: 1. f(AUB) = f(A) uf(B) 2. If AC B, then (A) ≤ f(B) 3. f-¹(CUD) = f¹(C)uf-¹ (D)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.5: Graphs Of Functions
Problem 59E
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Let /: X →Y be a function, A, BC X and C, DCY.
Show that:
1. f(AUB) = f(A) uf(B)
2. If AC B, then (A) ≤ f(B)
3. f-¹(CUD) = f¹(C)uf-¹ (D)
Transcribed Image Text:Let /: X →Y be a function, A, BC X and C, DCY. Show that: 1. f(AUB) = f(A) uf(B) 2. If AC B, then (A) ≤ f(B) 3. f-¹(CUD) = f¹(C)uf-¹ (D)
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