单词：diagonal sum
diagonal sum的用法和样例：
例句
- We prove sime equivalence between the trace and the eigenvalue of the product of two matrices, then extend them to the case of the sum of two matrices.摘要本文给出了两个矩阵积的迹与特徵值之间的若干等价关系，并推广到两回事个矩阵和的情形。
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