Proposition 7.2. Interchanging integral and limit Suppose fn E R[a, b] and fn → f uniformly on [a, b]. Then f E R[a, b] and . fn → S, f.

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Chapter2: Second-order Linear Odes
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Proposition 7.2. Interchanging integral and limit
Suppose fn E R[a, b] and fn → f uniformly on [a, b].
Then f E R[a, b] and fn → S" f.
Transcribed Image Text:Proposition 7.2. Interchanging integral and limit Suppose fn E R[a, b] and fn → f uniformly on [a, b]. Then f E R[a, b] and fn → S" f.
7. Prove the following theorem (which is a version of Proposition 7.2 valid for the infinite interval
[a, 0). )
Suppose that (fn); f, g are regulated functions on [0, R] for every R > 0 and satisfy:
(i) fn → f uniformly on [0, R], (ii) |fn(x)| < g(x) on [0, ∞), and (iii) ſº g is convergent.
Show that the improper integral f f exists and fn →
f as n → o.
Transcribed Image Text:7. Prove the following theorem (which is a version of Proposition 7.2 valid for the infinite interval [a, 0). ) Suppose that (fn); f, g are regulated functions on [0, R] for every R > 0 and satisfy: (i) fn → f uniformly on [0, R], (ii) |fn(x)| < g(x) on [0, ∞), and (iii) ſº g is convergent. Show that the improper integral f f exists and fn → f as n → o.
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