[線代] 有人能簡單證明這個定理嗎?
[-M M [M -M
M -M] 小於等於 -M M]
有沒有直觀 或是嚴謹的證法
證明這個式子成立
或是能夠先證明
[-M M
M -M] 小於等於 0
感謝
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