Matrix Inverses and Nonsingular Matrices - A First Course in Linear Algebra


We saw in Theorem CINM that if a square matrix \(A\) is nonsingular, then there is a matrix \(B\) so that \(AB=I_n\text{.}\) In other words, \(B\) is halfway to being an inverse of \(A\text{.}\) We will see in this section that \(B\) automatically fulfills the second condition (\(BA=I_n\)). Example MWIAA showed us that the coefficient matrix from Archetype A had no inverse. Not coincidentally, this coefficient matrix is singular. We will make all these connections precise now. Not many examples or definitions in this section, just theorems.

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Submitted At
September 11th, 2017
 3 years ago
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 Textbook
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 English
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September 11th, 2017 3 years ago

Submitted by Jim Fowler