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Results tagged with permutations
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user 82459
Questions related to permutations, bijections from a finite (or sometimes infinite) set to itself.
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intriguing Polytope
Define $E_{i,j} \in \mathbb{R}^{n \times n}$ to be the canonical basis (that is all elements set to zero except the entry $i,j$ )
let the bloc matrix $M \in \mathbb{R}^{n^2 \times n^2}$ defined by :
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