Drazin pseudoinverse
The most well-known generalization of the inverse of a matrix is the Moore-Penrose pseudoinverse. But there is another notion of generalized inverse, the Drazin pseudoinverse, for square matrices. If a matrix A has an inverse A−1 then it also has a Moore-Penrose pseudoinverse A+ and a Drazin pseudoinverse AD and A−1 =
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I’ve mentioned the Moore-Penrose pseudoinverse of a matrix a few times, most recently last week. This post will give an application of the pseudoinverse: computing effective graph resistance. Given a graph G, imagine replacing each edge with a one Ohm resistor. The effective resistance between two nodes in G is the electrical
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Prosecutors say the hacker stole information on 60 million students, an incident that matches the data breach at PowerSchool.
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