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Comme ça :

sage: P = polytopes.simplex(4)                                                    
sage: P.inequalities_list()                                                     
[[1, 0, -1, -1, -1, -1],
 [0, 0, 1, 0, 0, 0],
 [0, 0, 0, 1, 0, 0],
 [0, 0, 0, 0, 1, 0],
 [0, 0, 0, 0, 0, 1]]

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