The (2, 2, 0) group inverse problem |
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| Authors: | P Patrício RE Hartwig |
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| Institution: | a Departamento de Matemática e Aplicações, Universidade do Minho, 4710-057 Braga, Portugal
b Mathematics Department, N.C.S.U., Raleigh, NC 27695-8205, USA |
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| Abstract: | We characterize the existence of the group inverse of a two by two matrix with zero (2, 2) entry, over a ring by means of the existence of the inverse of a suitable function of the other three entries. Some special cases are derived. |
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| Keywords: | Group inverse Block matrices |
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