題組內容
11. Let V be an inner product space and 
(ii) (9 分) If v is not a zero vector, show that 
if and only if there exists a scalar
such that u = σv.
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11. Let V be an inner product space and
(ii) (9 分) If v is not a zero vector, show that if and only if there exists a scalarsuch that u = σv.