Re: [線代] 線代(9)

[Dirichlet ( )]

※ 引述《PttFund (批踢踢基金只進不出)》之銘言：
:                                       _
: Can you find a 2╳2 unitary matrix U, U U^T = I and det U≠±1?
: If not, explain why not.

U = (i 0)
    (0 1)


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