Suppose that R³ is given the norm ||(x, y, z) || = |x|+|y| + |2| and let S = {(x, y, z) = R³: 2x + y - 3z = 0}. Define a functional f on S by f(x, y, z) = x - z. (b) Determine ||f||.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Suppose that R³ is given the norm ||(x, y, z) || = |x|+|y| + |2| and let
S = {(x, y, z) = R³: 2x + y - 3z = 0}.
Define a functional f on S by f(x, y, z) = x - z.
(b) Determine ||f||.
Transcribed Image Text:Suppose that R³ is given the norm ||(x, y, z) || = |x|+|y| + |2| and let S = {(x, y, z) = R³: 2x + y - 3z = 0}. Define a functional f on S by f(x, y, z) = x - z. (b) Determine ||f||.
Expert Solution
Step 1: Introduction

Given that R3 has a norm ||(x,y,z)||=|x|+|y|+|z|.

The given set is S={(x,y,z)R3:2x+y3z=0}.

Now define a linear functional f on S by f(x,y,z)=xz.

We need to find ||f||.

We know that the norm of a functional f on a set S is defined as ||f||=sup{|f(v)|||v||:vS,v0S}.

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