(1) Show that I + Y X is also invertible. (2) Show that Y (I + XY )−1 = (I + Y X)−1Y .

College Algebra
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ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter6: Matrices And Determinants
Section: Chapter Questions
Problem 1CC
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Given a m ×n matrix X and a n ×m matrix Y , suppose I +XY is invertible.
(1) Show that I + Y X is also invertible.

(2) Show that Y (I + XY )−1 = (I + Y X)−1Y . 

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