Note: N(A) denotes the null space of the matrix A, while R(A) stands for the range of A, viz., the column space of A. = 1. (a) Let matrices A, B, C be such that A R(B), whereas N(C) ≤ N(A). BC. Show that R(A) C (b) Show that N(ATA) N(A) for any matrix A, even rectangular. (Hint: Ax = 0 iff || Ax ||= 0.) (c) Using (b), show that R(ATA) = R(AT). =
Note: N(A) denotes the null space of the matrix A, while R(A) stands for the range of A, viz., the column space of A. = 1. (a) Let matrices A, B, C be such that A R(B), whereas N(C) ≤ N(A). BC. Show that R(A) C (b) Show that N(ATA) N(A) for any matrix A, even rectangular. (Hint: Ax = 0 iff || Ax ||= 0.) (c) Using (b), show that R(ATA) = R(AT). =
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
Matrix Analysis parctice question, please show clear, thanks

Transcribed Image Text:Note: N(A) denotes the null space of the matrix A, while R(A) stands for
the range of A, viz., the column space of A.
1. (a) Let matrices A, B, C be such that A
R(B), whereas N(C) ≤ N(A).
(b) Show that N(ATA)
(Hint: Ax
=
=
0 iff || Ax ||= 0.)
=
N(A) for any matrix A, even rectangular.
BC. Show that R(A) ≤
=
(c) Using (b), show that R(ATA) = R(AT).
=
(Hint 1. Let A, B be matrices such that R(A) ≤ R(B). If rk(A) =
rk(B), then show that the subspaces are equal.
Hint 2. rank + nullity dimension of codomain).
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