恒等矩阵的特殊之处在于它应用到顶点时保持不变。
The identity matrix is special in that when it is applied to vertices, they are unchanged.
本文应用形式矩阵的计算技巧，得到李善兰恒等式的一个等价命题，进而给出李善兰恒等式的一个初等证明。
In this article we apply formal matrices technique to get a equivalent proposition of Li Shanian identity, and hence give an elementary proof for Li Shanlan identity.
我们可以在简明矩阵式中重述公式（3）中的输出会计恒等式。
We can re-write the output accounting identity in expression (3) in condensed matrix form.
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