Prove if f is a nonnegative measurable function, then there exists an increasing sequence (ϕn) of simple functions that converges pointwise to f.
Prove if f is a nonnegative measurable function, then there exists an increasing sequence (ϕn) of simple functions that converges pointwise to f.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Simple Approximation Theorem: An extended real-value function f on a measurable set E is measurable if and only if there is a sequence {ϕn} of simple functon on E which converges pintwise on E to f and has the property that
|ϕn| ≤ |f| on E for all n.
If f is nonnegative, we may choose {ϕn} to be increasing.
Prove if f is a nonnegative measurable function, then there exists an increasing sequence (ϕn) of simple functions that converges pointwise to f.
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