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2 a Find a reduced and full QR factorisation of the matrix 2 1 11 2 0 B b Let A be an m x

2 a Find a reduced and full QR factorisation of the matrix 2 1 11 2 0 B b Let A be an m x m matrix and let a be its jth column Using the full QR factorisation of A prove Hadamard s inequality m det A aj 2

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