3. Show that for any vector v e R°, P(v) is perpendicular to u. 4. Show that if P(v) = 0 then v is a sc alar multiple of u. 5. True or false: any vector v e R³ can be expressed as a sum v = w + w' where w is a scalar multiple of u and w' is perpendicular to u. Does the mapping P relate to this? 6. Suppose v1, v2 are two nonzero vectors perpendicular to u and to each other. What are the values of P on u, v1. 2?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.6: The Matrix Of A Linear Transformation
Problem 6AEXP
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Could you solve parts 4,5,and 6?

Problem 5. Let u be a unit vector in R3 and let P: R³ → R³ be defined by P(v) = v – (v • u)u.
1. Show that P is linear.
2. Show that PoP= P.
1
3. Show that for any vector v e R³, P(v) is perpendicular to u.
4. Show that if P(v) = 0 then v is a scalar multiple of u.
5. True or false: any vector v E R³ can be expressed as a sum v = w + w' where w is a scalar
multiple of u and w' is perpendicular to u. Does the mapping P relate to this?
6. Suppose vi, v2 are two nonzero vectors perpendicular to u and to each other. What are the
values of P on u, v1, v2?
Transcribed Image Text:Problem 5. Let u be a unit vector in R3 and let P: R³ → R³ be defined by P(v) = v – (v • u)u. 1. Show that P is linear. 2. Show that PoP= P. 1 3. Show that for any vector v e R³, P(v) is perpendicular to u. 4. Show that if P(v) = 0 then v is a scalar multiple of u. 5. True or false: any vector v E R³ can be expressed as a sum v = w + w' where w is a scalar multiple of u and w' is perpendicular to u. Does the mapping P relate to this? 6. Suppose vi, v2 are two nonzero vectors perpendicular to u and to each other. What are the values of P on u, v1, v2?
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