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Reference.org
Incomplete LU factorization
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<p>In <a href="/facts/Numerical_linear_algebra/jnS6Tteb">numerical linear algebra</a>, an incomplete LU factorization (abbreviated as ILU) of a <a href="/facts/Matrix_(mathematics)/qa8FI4ko">matrix</a> is a <a href="/facts/Sparse_matrix/FFtN0XjR">sparse</a> approximation of the <a href="/facts/LU_factorization/M13Ew8RD">LU factorization</a> often used as a <a href="/facts/Preconditioner/MUvFta7g">preconditioner</a>. </p>