Let X be a separable normed vector space and f : X → R be uniformly continuous and bounded. Show: For any sequence (xn) in X, there exists a subsequence (xn;) and a continuous function f : X → R such that f (an, + x) → f(x), j → 0, x €X, and sup f(xn, + x) – f(x)| →0, j → , rɛD for any compact subset of D of X.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Let X be a separable normed vector space and f : X → R be uniformly
continuous and bounded.
Show: For any sequence (xn) in X, there exists a subsequence (xn;) and
a continuous function f : X → R such that
f (xn; + x) → f(x),
j → 0,
x € X,
and
sup |f (xn, + x) – f(x)|→ 0,
j → 00,
rɛD
for any compact subset of D of X.
Hint: Define fn : X → R by
fn(x) = f(xn + x),
x € X, n E N.
Transcribed Image Text:Let X be a separable normed vector space and f : X → R be uniformly continuous and bounded. Show: For any sequence (xn) in X, there exists a subsequence (xn;) and a continuous function f : X → R such that f (xn; + x) → f(x), j → 0, x € X, and sup |f (xn, + x) – f(x)|→ 0, j → 00, rɛD for any compact subset of D of X. Hint: Define fn : X → R by fn(x) = f(xn + x), x € X, n E N.
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