[線代] dual norm of dual norm
假設 ∥‧∥ 為一 vector norm
T
定義∥x∥* = max ∥y x∥ 為其dual norm
∥y∥=1
則 (∥x∥*)* = ∥x∥ (the dual norm of dual norm is the original norm.)
想請問要怎樣證明這件事
因為網路上找不太到證明...
謝謝
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