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The Factor Width Rank of a Matrix

Johnston, Nathaniel et al.
arXiv (All) · Papers
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combinatorics
A matrix is said to have factor width at most $k$ if it can be written as a sum of positive semidefinite matrices that are non-zero only in a single $k \times k$ principal submatrix. We explore the ``factor-width-$k$ rank'' of a matrix, which is the minimum number of rank-$1$ matrices that can be us
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