Read the following carefully, and then answer the questions that follow. We say that two n x n matrices are cousins, if there is some invertible matrix P so that A = PBP1 *Notice that if A and B are cousins, then 5 = PAP = (P-A(P)-. Thus, the definition is "symmetric" (ie the order we say it doesn't matter): if A and B are cousins then B and A are counins. One of the first things you might notice about the notion of cousins, it that it is clearly connected to diagonalizability: Theorem 1 A matrix A is diagonalizable if and only if there is a diagonal matrix D so that A and D are cousins. One might think from the definition that the main use of the definition of cousin matrices is to reframe díagonalizability. However, it actually allows us to generalize it in useful ways - in the following example and the first question below, we'll see matrices A and B which are cousins, but where neither of which is diagonal, and for which techniques from our study of diagonalizable Thm Definition
Read the following carefully, and then answer the questions that follow. We say that two n x n matrices are cousins, if there is some invertible matrix P so that A = PBP1 *Notice that if A and B are cousins, then 5 = PAP = (P-A(P)-. Thus, the definition is "symmetric" (ie the order we say it doesn't matter): if A and B are cousins then B and A are counins. One of the first things you might notice about the notion of cousins, it that it is clearly connected to diagonalizability: Theorem 1 A matrix A is diagonalizable if and only if there is a diagonal matrix D so that A and D are cousins. One might think from the definition that the main use of the definition of cousin matrices is to reframe díagonalizability. However, it actually allows us to generalize it in useful ways - in the following example and the first question below, we'll see matrices A and B which are cousins, but where neither of which is diagonal, and for which techniques from our study of diagonalizable Thm Definition
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.2: Mathematical Induction
Problem 29E
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