7. Let A and B be bounded nonempty subsets of R, and let A + B := {a+b : a € A, b € B}. Prove that sup(A + B) = sup A + sup B and inf(A + B) = inf A +inf B.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.5: Graphs Of Functions
Problem 56E
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7. Let A and B be bounded nonempty subsets of R, and let A + B := {a+b : a € A, b € B}. Prove
that sup(A + B) = sup A + sup B and inf(A + B) = inf A +inf B.
Transcribed Image Text:7. Let A and B be bounded nonempty subsets of R, and let A + B := {a+b : a € A, b € B}. Prove that sup(A + B) = sup A + sup B and inf(A + B) = inf A +inf B.
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