Question 3 Assume that a sequence of integrable functions (fn)n converges pointwise to an integrable function f, a.e. and (fn)n converges to f absolutely in mean. Prove that (fn)n converges strongly to f. (Hint: Apply Fatou's Lemma to the sequence gn = |fn|+|f|-|fn-f).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.1: Infinite Sequences And Summation Notation
Problem 73E
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Question 3
Assume that a sequence of integrable functions (fn)n converges pointwise to
an integrable function f, a.e. and (fn)n converges to f absolutely in mean.
Prove that (fn)n converges strongly to f.
(Hint: Apply Fatou's Lemma to the sequence gn = |fn|+|f|-|fn - fl).
Transcribed Image Text:Question 3 Assume that a sequence of integrable functions (fn)n converges pointwise to an integrable function f, a.e. and (fn)n converges to f absolutely in mean. Prove that (fn)n converges strongly to f. (Hint: Apply Fatou's Lemma to the sequence gn = |fn|+|f|-|fn - fl).
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