A doubly stochastic matrix has each row sum and each column sum equal to 1.
双随机矩阵的每一行之和与每一列之和都等于 1。
By the Birkhoff–von Neumann theorem, any doubly stochastic matrix can be written as a convex combination of permutation matrices.
根据比尔科夫—冯·诺伊曼定理,任何双随机矩阵都可以表示为若干置换矩阵的凸组合。