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In which of these methods, after factorization, the pattern of zero elements in the combined L and U matrices the same as the original coefficient matrix?

In which of these methods, after factorization, the pattern of zero elements in the combined L and U matrices the same as the original coefficient matrix? Correct Answer LU decomposition

The extra non-zero elements in the factorized matrices are called fill-ins. In ILU(p), p indicates the order of fill-in allowed. So, where there is no fill-in, the pattern of combined L and U matrices and the coefficient matrix will be the same.

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