作者KJLP (PWKJ)
看板Math
标题[线代] 一题线代
时间Fri Feb 11 16:40:52 2011
1)A is a k×k matrix all of whose entries are ±1
and whose rows are mutually orthogonal.
Suppose that A has an m×n submatrix whose entries are all 1.
show that mn≦k.
实在没头绪的一题 感觉应该是要利用A的每列orthogonal
以及子矩阵每列相同这点?
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 111.248.6.229
※ 编辑: KJLP 来自: 111.248.6.229 (02/11 16:41)