. Explain what changes in your formula when L is a general invertible lower- triangular matrix and how it reveals that the inverse of a lower-triangular matrix is lower-triangular  b). give a concise proof that the inverse of an upper triangular matrix is upper triangular

Calculus For The Life Sciences
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Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter10: Matrices
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a). Explain what changes in your formula when L is a general invertible lower- triangular matrix and how it reveals that the inverse of a lower-triangular matrix is lower-triangular

 b). give a concise proof that the inverse of an upper triangular matrix is upper triangular

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