Show f e Lla, b] if and only if |f| E L[a,b].
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Related questions
Question
Show f ∈ L∞[a, b] if and only if |f| ∈ L∞[a, b].
Expert Solution
Step 1
The infinity norm of a function on is defined as:
.
Suppose , therefore there exists such that:
Now consider the function , defined as:
Therefore, infinity norm of can be calculated as:
Hence, .
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