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對角矩陣:aij=0當i不等於j時 上三角:aij=0當i大於j時 下三角矩陣:aij=0當i小於j時 那麼如果是對角的話顯然滿足後面兩個條件 反之,如果後面兩個條件同時滿足一定說明只要i不等於j時aij=0所以也時對角的.
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