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  3. let a be an upper (lower) triangular matrix.a) sho

Let A be an upper (lower) triangular matrix.a) Show that A is invertible if and...

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Let A be an upper (lower) triangular matrix.a) Show that A is invertible if and only if the diagonal entries of A are all nonzero.b) Show that if A is invertible, then A is also an upper (lower) triangular matrix.

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