Let A and B be n x n matrices. 1. If A and B are anti-symmetric matrices that commute under multiplication, show that their product AB is symmetric. 2. A matrix A is called nilpotent of degree 2 if A² = 0. Show that if A is nilpotent of degree 2, then the matrix (I - A) is invertible, and find an expression for its inverse.

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Let A and B be n x n matrices.
1. If A and B are anti-symmetric matrices that commute under multiplication, show that their product AB is symmetric.
2. A matrix A is called nilpotent of degree 2 if A² = 0. Show that if A is nilpotent of degree 2, then the matrix (I - A) is invertible, and find
an expression for its inverse.
Transcribed Image Text:Let A and B be n x n matrices. 1. If A and B are anti-symmetric matrices that commute under multiplication, show that their product AB is symmetric. 2. A matrix A is called nilpotent of degree 2 if A² = 0. Show that if A is nilpotent of degree 2, then the matrix (I - A) is invertible, and find an expression for its inverse.
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