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==Formal definition==
Various formulations of this problem can be found in the literature. Using cost-functions, the '''<math>D</math>{{
:Given <math>D</math> sets, <math>A</math> and <math>J_1, \ldots J_{D-1}</math>, of equal size, together with a cost [[array]] or multidimensional [[weight function]] <math>C</math> : <math>A \times J_1 \times \ldots \times J_{D-1} \rightarrow \mathbb{r}_+</math> . Find <math>D-1</math> [[permutation]]s <math>\pi_{d}</math> : ''A'' → <math>J_d</math> such that the total [[Loss function|cost function]]:
::<math>\sum_{a\in A}C(a,\pi_{1}(a),\ldots,\pi_{D-1}(a))</math>
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