Abstract
For an n × n matrix ring over a division ring we investigate the structure of all subrings which have the property that every projection onto a component is either the zero map or surjective. It turns out that many of these rings are semiprimary.
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Fuchs, P.R., van Wyk, L. On Subrings of Simple Artinian Rings. Results. Math. 24, 49–65 (1993). https://doi.org/10.1007/BF03322316
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DOI: https://doi.org/10.1007/BF03322316