Let fn E D[0, 1]. Suppose that fh g on [0, 1], and lim fn(1/2) exists. For each x E [0, 1], show that n00 is Cauchy.

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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let fn E D[0, 1]. Suppose that fh3 g on [0, 1], and lim fn(1/2) exists. For each x E [0, 1], show that
n00
( fa(=)) neN
is Cauchy.
Hint: use the Lagrange MVT for F(x) = fn(x) – fm(x)
Remark: this implies the existence of pointwise limit f(x) = lim fn(x) and by the Differentiation Limit Theorem,
n-00
f'(2) = g(x).
Transcribed Image Text:Let fn E D[0, 1]. Suppose that fh3 g on [0, 1], and lim fn(1/2) exists. For each x E [0, 1], show that n00 ( fa(=)) neN is Cauchy. Hint: use the Lagrange MVT for F(x) = fn(x) – fm(x) Remark: this implies the existence of pointwise limit f(x) = lim fn(x) and by the Differentiation Limit Theorem, n-00 f'(2) = g(x).
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