非空集合 u_2(R,S)的特征

The Characteristics of the Nonempty Class u2(R,S)

设ｕ２（Ｒ，Ｓ）是所有具有指定行和向量Ｒ与列和向量Ｓ的（０，１，２）－矩阵组成的集合本文研究集合ｕ２（Ｒ，Ｓ）非空时间量Ｒ与Ｓ之间的关系。

Let u2(R,S)be the class of all(0,1,2)matrices with a prescribed row sum vector R and column sum vector S,the relationship between the vector R and the vector Sof the nonempty class u2(R,S)are studied.