Summary
Structure of allg-inverses of a matrix in a weak sense is shown. Characterizations of main subclasses ofg-inverses are investigated thoroughly. The dualities among subclasses and the relation betweeng-inverses and projections are stressed. The Gauss-Markov theorem reduces to a duality of two types ofg-inverses
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A preliminary Japanese version was published by the author in theProc. Inst. Statist. Math., Vol. 17, (1969) with the title “Generalized inverses of matrices—Part 1”.
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Sibuya, M. Subclasses of generalized inverses of matrices. Ann Inst Stat Math 22, 543–556 (1970). https://doi.org/10.1007/BF02506375
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DOI: https://doi.org/10.1007/BF02506375