Abstract
This is an attempt at a comprehensive expository study of those nonnegative matrices which happen to be inverses of M-matrices and is aimed at an audience conversant with basic ideas of matrix theory. A theme is the parallels (and differences) between the class of M-matrices and the class of inverse M-matrices. Among the primary tools used are diagonal multiplications, the Neumann expansion, and the form of the inverse of a partitioned matrix. Some of the results seem not to have appeared before, and several unsolved problems are mentioned.
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