Re: [理工] 線性代數 指數內積問題
: 小弟一直想不出來,觀念也不是很清楚,
: 為什麼Bi跟Bj內積會等於0...
: 跪求指導
z_1 = 1
z_2 = exp(i2Pi/3) = exp(i8Pi/3)
z_3 = exp(i4Pi/3)
z_2* = z_3
顯然
z_1 + z_2 + z_3 = 0
=> B_1 B_2的內積 = 0
B_1 B_3的內積 = 0
z_1 z_1* + z_2 z_3* + z_3 z_2*
= 1 + z_2 z_2 + z_3 z_3
= 1 + [z_2 + z_3][z_2 + z_3] - 2 z_2 z_3
= 1 + 1 - 2
= 0
=> B_2 B_3的內積 = 0
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