Compute L and U for the symmetric matrix A: A = a La ...

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Compute L and U for the symmetric matrix A: A = τα α a La α a a b b b b C C b C d] Find four conditions on a, b, c, d to get A = LU with four nonzero values in pivot positions. Compute L and U for the symmetric matrix A: A = τα α a La α a a b b b b C C b C d] Find four conditions on a, b, c, d to get A = LU with four nonzero values in pivot positions.