/sci/ - Science & Math

>>11306467
>x1=x2=0
If by this you mean that the charactheristic polynomial is [math]x^2(x-4)[/math], then it is 0 that has multiplicity 2, so 0 has a bidimensional eigenspace, and 4 has only a line. Notice that this is only possible if your matrix has all zeroes except a 4 on the diagonal.

>>11306448
Because [math]8^{2/3}=4[/math]

>>11306447
By struggling with the problems yourself instead of just reading proof on a book.