第二步，我们要找另一个矩阵，叫代数余子式。

Step two: we go to another matrix that's called cofactors.

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本文的另一个结果是获得了求节点导纳矩阵任意一个二阶代数余子式的拓扑公式。

Another result is presented a topological formula for any 2-order algebraic cofactor in passive network node admittance matrixes.

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给出有关代数余子式之和的几个性质并予以证明，且给出利用代数余子式之和计算行列式的方法。

This paper elaborates several features of the sum of the cofactor of a determinant and provides the method to calculate the determinant of a Matrix by the sum of the cofactor of a determinant.

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给出有关代数余子式之和的几个性质并予以证明，且给出利用代数余子式之和计算行列式的方法。

This paper elaborates several features of the sum of the cofactor of a determinant and provides the method to calculate the determinant of a Matrix by the sum of the cofactor of a determinant.

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