Birkhoff polytope
= Birkhoff polytope
{wiki=Birkhoff_polytope}
The Birkhoff polytope, often denoted as \\( \\text\{B\} \\), is a convex polytope that represents the set of all doubly stochastic matrices. A doubly stochastic matrix is a square matrix of non-negative entries where each row and each column sums to 1.