Obtaining a Triangular Matrix by Independent Row-Column Permutations

  title={Obtaining a Triangular Matrix by Independent Row-Column Permutations},
  author={Guillaume Fertin and Irena Rusu and St{\'e}phane Vialette},
Given a square (0, 1)-matrix A, we consider the problem of deciding whether there exists a permutation of the rows and a permutation of the columns of A such that after carrying out these permutations, the resulting matrix is triangular. The complexity of the problem was posed as an open question by Wilf [7] in 1997. In 1998, DasGupta et al. [3] seemingly answered the question, proving it is NP-complete. However, we show here that their result is flawed, which leaves the question still open… CONTINUE READING

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