60. (a) Prove that rank(AB) <= rank(A). [Hint: Review  Exer cise 30 in Section 3.1 or use transposes and  Exercise 59(a).]   (b) Give an example in which rank(AB) < rank(A).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.3: Lines
Problem 76E
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60. (a) Prove that rank(AB) <= rank(A). [Hint: Review  Exer cise 30 in Section 3.1 or use transposes and  Exercise 59(a).]  

(b) Give an example in which rank(AB) < rank(A). 

 

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