虽然二维数组与线性代数中的矩阵类似，但是对它们的操作(比如乘)与线性代数中的操作(比如矩阵乘)是完全不同的。

Even though two-dimensional arrays are similar to matrices from linear algebra, operations (such as multiply) have nothing to do with the operations in linear algebra (such as matrix multiplication).

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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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