[線代] AB = BA 的條件?
請問各位大大
AB = BA 的條件是什麼呢?
除了 A B 皆為對角矩陣外, 還有哪些條件成立呢?
( A , B 非零)
P.S. 如果 A B 皆為正交矩陣,則會不會有什麼特殊狀況成立呢?
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