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Kirill Terekhov authored
Added multilevel version of crout-ilu solver with maximum product transversal preordering on each level. The multilevel version is based on condition number estimation, factorization of rows with large condition number or small diagonal is postponed for the next level. Fixes for near-zero values in maximum product transversal algorithm and negative path-length. Fixes for output in DrawMatrix, option for text-based output for small matrices.
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