By using Boolean matrix, some results of power convergence exponent of line digraph are given.
采用布尔矩阵，得到了线有向幂敛指数的一些结果。
A family of symmetric primitive matrix with small exponent is characterized, consequently a foundation is laid for the complete characterization of symmetric primitive matrix problem.
讨论了一类小指数对称本原矩阵的刻画问题，为对称本原矩阵的完全刻画奠定基础。
Among current methods analyzing grounding grids in power current, the nodal method of analysis is the easiest and least exponent number of matrix in calculation.
节点电压法是当前分析接地网最简单、计算中矩阵的阶数最小的方法之一。
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