Exercise 4 Let X andY be a normed vector spaces and let T: X → Y be a linear operator. Define ||2||a = ||x|| + ||Tæ|| V x € X. Show that, since |· || is a norm, ||· |la is also a norm.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter6: Vector Spaces
Section6.1: Vector Spaces And Subspaces
Problem 42EQ
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Exercise 4 Let X and Y be a normed vector spaces and let T : X → Y be a linear
operator. Define
||x||a = ||x|| + ||Tx|| V x E X.
Show that, since ||· || is a norm, ||· ||a is also a norm.
Transcribed Image Text:Exercise 4 Let X and Y be a normed vector spaces and let T : X → Y be a linear operator. Define ||x||a = ||x|| + ||Tx|| V x E X. Show that, since ||· || is a norm, ||· ||a is also a norm.
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