題組內容
4. Let A be a skew-symmetric n×n matrix (i.e. 
= -A).
(a) Prove that xᵀAx = 0 for all x ∈ 
.
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4. Let A be a skew-symmetric n×n matrix (i.e. = -A).
(a) Prove that xᵀAx = 0 for all x ∈ .