Re: [理工] [線代]-Linear transformation
: ※ 引述《gn00618777 (123)》之銘言:
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: → gn00618777:為何ket(T)只有0時代表為one-to-one 03/18 19:44
證明 若T是線性映射(阿斯...) V -> W 則 T 是 1-1 <=> ker(T)=0
=>
Suppose T be 1-1,then for all v , 0 (- V ,T(v)=T(0)=0 => v=0
So,ker(T)=0
<=
Suppose ker(T)=0.
If T is not 1-1,then exists x!=y such that T(x)=T(y) => T(x-y)=0.
So,x-y (- ker(T) => x=y OMG!! 矛盾嚕~ 假設錯誤
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