(a) Let X be a normed linear space and M be a closed linear subspace of X. Let x, e X be such that x, € M and r = d(x, M). Show that there is a bounded linear functional f on X such that f(x,) = 1, f(y) = 0 for all %3D 1 y e M and || f || = . %3D r

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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(a)
Let X be a normed linear space and M be a
closed linear subspace of X. Let x, e X be
such that x, M and r = d(x, M). Show
that there is a bounded linear functional
f on X such that f(x,) = 1, f(y) = 0 for all
y e M and || f || = 2.
1
%3D
Transcribed Image Text:(a) Let X be a normed linear space and M be a closed linear subspace of X. Let x, e X be such that x, M and r = d(x, M). Show that there is a bounded linear functional f on X such that f(x,) = 1, f(y) = 0 for all y e M and || f || = 2. 1 %3D
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