A=αTβ=
⎛
⎜
⎜
⎜
⎝
1
−1
−1
1
⎞
⎟
⎟
⎟
⎠
(−1,1,1,−1)
=⎛
⎜
⎜
⎜
⎝
−1
1
1
−1
−1
1
1
−1
−1
1
1
−1
1
−1
−1
1
⎞
⎟
⎟
⎟
⎠
A²=A·A=
⎛
⎜
⎜
⎜
⎝
−1
1
1
−1
−1
1
1
−1
−1
1
1
−1
1
−1
−1
1
⎞
⎟
⎟
⎟
⎠
⎛
⎜
⎜
⎜
⎝
−1
1
1
−1
−1
1
1
−1
−1
1
1
−1
1
−1
−1
1
⎞
⎟
⎟
⎟
⎠
=⎛
⎜
⎜
⎜
⎝
2
0
0
0
0
2
0
0
0
0
2
0
0
0
0
2
⎞
⎟
⎟
⎟
⎠
A³=A·A²=
⎛
⎜
⎜
⎜
⎝
−1
1
1
−1
−1
1
1
−1
−1
1
1
−1
1
−1
−1
1
⎞
⎟
⎟
⎟
⎠
⎛
⎜
⎜
⎜
⎝
2
0
0