2楼: Originally posted by feixiaolin at 2013-12-04 18:08:15
建议楼主追加5个金币。

BCA4ADA3682E3747.jpg

6楼: Originally posted by hanbinddd at 2013-12-05 14:30:33
这个没人帮忙吗？？

7楼: Originally posted by hank612 at 2013-12-05 15:09:43
6.1 If N(A^p)=N(A^{p+1}), we can prove that
N(A^{p+1})=N(A^{p+2}).
如果 x is in N(A^{p+2}), 即 A^{p+1} (Ax)=0, 从而 A^p(Ax)=0, 所以
x  is in N(A^{p+1}).

6.2 任意v= A/3 (v) - 1/3*(A-3E) (v), 而 ...