dimension of the identity matrix

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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AB=
As another illustration, for scalars, the equation cd ce (with c
d3e. The same does not hold for matrices. Thus, given
although neither A nor B is itself a zero matrix.
%3D
D.
3 2
[: ]--
we find that
CD = CE =
15 24
· even though D E.
These strange results actually pertain only to the special class of
singular matrices, of which the matrices A, B, and Care examples. (R
ces contain a row. which is a multiple of another row.) Nevertheless
reveal the pitfalls of unwarranted extension of algebraic theorems to r
4.5
Given A =
0-2 4
=x p
1. Calculate: (a) AI
Indicate the dimension of the identity matrix used in each case.
(b) IA
1,X (p)
Transcribed Image Text:AB= As another illustration, for scalars, the equation cd ce (with c d3e. The same does not hold for matrices. Thus, given although neither A nor B is itself a zero matrix. %3D D. 3 2 [: ]-- we find that CD = CE = 15 24 · even though D E. These strange results actually pertain only to the special class of singular matrices, of which the matrices A, B, and Care examples. (R ces contain a row. which is a multiple of another row.) Nevertheless reveal the pitfalls of unwarranted extension of algebraic theorems to r 4.5 Given A = 0-2 4 =x p 1. Calculate: (a) AI Indicate the dimension of the identity matrix used in each case. (b) IA 1,X (p)
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