请教一个简单的不等式问题
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作者:icky (等级:15 - 最接近神,发帖:7923) 发表:2007-09-08 01:40:40  14楼  评分: 
... Can you prove that?Note what I said, for equation: if a = b then c = d a+b=c+d but for inequation, if a > b then c > d => a+b > c+d but a+b > c+d (not =>) c > d A simple counterexample: A = [ 1 1 ; 1 2] is PD B = [2;3] and AX > B (1) But we can't say X > A^-1 * b = [1;1] (2) Since obviously x1 = 0, x2 = 3 fits (1) but not (2)
aiyah....
that's solving simultaneous inequalities, then why do u need to generate to matrix form?

use geometric solutions
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