Connectivity, maxima and minima, and other graph and matrix concepts are explained here.
连通性、最大通路和最小通路以及其他图和矩阵的概念在本章中都进行了介绍。
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That means if you were able to solve and eliminate the variable that would be a critical point. When you have the same problem, as we have critical points, are they maxima or minima?