[理工] 線代
n n
(1) If T:R -> R is a function such that ||T(u)-T(v)||=||u-v||
n
for all vectors u and v in R , then T is an orthogonal
oprator.
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F:||T(u)||=||u|| for all u in R .
<=>T is an ortogonal operators.
這樣這題沒有保內積嗎?
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