Question: Verify Theorem 1.7.1 d for the matrices A and B in Exercise 12. Theorem 1.7.1 d The inverse of an invertible lower triangular matrix is

Verify Theorem 1.7.1 d for the matrices A and B in Exercise 12.
Theorem 1.7.1 d
The inverse of an invertible lower triangular matrix is lower triangular, and the inverse of an invertible upper triangular matrix is upper triangular.

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