[理工] 線代
1.http://tinyurl.com/7vcj5ee
想問為什麼要先做s=0,t=1為什麼不能先做s=-3,t=0
2.A:nx n,n:odd
證:A is singular
<pf>
∵A^T=-A
→det(A^T)=det(-A)
→det(A)=(-1)^n det(A) =-det(A)
→det(A)=0
∴A is singular
一開始A^T=-A是怎麼知道的?
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