4. (a) What is the conformability condition of a matrix? Consider the following matrices: T2 81 [6 21 L7 31 A =3 0; B= ; and C= i) Show that AB is defined. Determine AB. Is it possible to determine BA? Why? ii) Is BC defined? Determine BC. Is CB defined? If so, determine CB. Is it true that BC = CB? (b) Define transposed and inverse matrices with their relevant properties. Consider the following matrix equation: A -I- X(X'X)' x' Are Á, (X'X) and X necessarily square matrices? Show that A is an idempotent matrix.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter4: Eigenvalues And Eigenvectors
Section4.4: Similarity And Diagonalization
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Give me the answer of (a)- i), ii) and (b), please
4.
(a) What is the conformability condition of a matrix? Consider the following matrices:
[2
81
c-19
21
31
A =
B=
; and C=
i) Show that AB is defined. Determine AB. Is it possible to determine BA? Why?
ii) Is BC defined? Determine BC. Is CB defined? If so, determine CB. Is it true that
BC = CB?
(b) Define transposed and inverse matrices with their relevant properties. Consider the
following matrix equation:
A -I- X(X'X)' x'
Are A, (X'X) and X necessarily square matrices? Show that A is an idempotent matrix.
Transcribed Image Text:4. (a) What is the conformability condition of a matrix? Consider the following matrices: [2 81 c-19 21 31 A = B= ; and C= i) Show that AB is defined. Determine AB. Is it possible to determine BA? Why? ii) Is BC defined? Determine BC. Is CB defined? If so, determine CB. Is it true that BC = CB? (b) Define transposed and inverse matrices with their relevant properties. Consider the following matrix equation: A -I- X(X'X)' x' Are A, (X'X) and X necessarily square matrices? Show that A is an idempotent matrix.
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