대한수학회보 (Bulletin of the Korean Mathematical Society)
- 제33권2호
- /
- Pages.311-318
- /
- 1996
- /
- 1015-8634(pISSN)
- /
- 2234-3016(eISSN)
Linear transformations that preserve the assignment on R=Em and S=(S1,· · ·,SN)
초록
For positive integral vectors $R = (r_1, \cdots, r_m)$ and $S = (s_1, \cdots, s_n)$, we consider the class $U(R,S)$ of all $m \times n$ matrices of 0's and 1's with the row sum vector R and the column sum vector S.