Consider the sequence of functions {fn}=2 where fn: [a, b] → R defined for n 2 2 by if 0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Consider the sequence of functions {fn}n=2 where fr: [a, b] → R defined for n > 2 by
n2x
if 0 <x<
fn
-n2 (x
if sxs1
a. Prove {fn}=2 converges pointwise to f(x) = 0.
Transcribed Image Text:Consider the sequence of functions {fn}n=2 where fr: [a, b] → R defined for n > 2 by n2x if 0 <x< fn -n2 (x if sxs1 a. Prove {fn}=2 converges pointwise to f(x) = 0.
Expert Solution
Step 1: Given.

Definition: Suppose fn is a sequence of functions fn:S and f:S. Then fnf pointwise on S if fn(x)f(x) as n for every xA.

Given: fn:a, b defined for n2 by fn(x)=n2x,if 0x1n-n2x-2n,if 1nx2n0,if 2nx1

To prove: fnn=2 converges pointwise to f(x)=0.

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