[線代] orthogonal
let x1, x2 and x3 be vectors in R^3
if x1垂直x2, and x2垂直x3,
is it necessarily true that x1垂直x3 ?
我把圖畫出來 我想應該是false
可是我不知道該怎麼寫證明
請好心的大大指點一下
謝謝
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