[線代] 幾個命題的真偽
寫題目的時候碰到幾個不確定的敘述
1)A and B are n*n matrices, AB = O, then all eigenvalues of BA are 0.
2)A is a n*n matrix over R s.t A^2=-I_n, then
( i ) n must be even
(ii ) tr(A)≠0
(iii) if B^2=-I_n , then A.B are similar
這四條命題實在很不確定 Q Q
有請前輩指教!
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