Let A be a 2x2 matrix , and call a line through the origin of R^2 invariant
under A if Ax lies on the line when x does, Find equations for all lines in
R^2 , if any, that are invariant under the matrix A = [ 4 -1 ]
[ 2 1 ]
http://ppt.cc/0BOT
黄老师例题的一题， 能找出 w= ax+by=0
这时候要考虑两种情况 ，一是a=0 和 a!=0 ，这时候就比较看不懂了
能告诉我思考方向吗？