On group nil rings
E. Puczyłowski (1976)
Fundamenta Mathematicae
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E. Puczyłowski (1976)
Fundamenta Mathematicae
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Veldsman, Stefan (2001)
Mathematica Pannonica
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Manfred Dugas, Shalom Feigelstock (2004)
Rendiconti del Seminario Matematico della Università di Padova
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Andruszkiewicz, R. (2004)
Serdica Mathematical Journal
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2000 Mathematics Subject Classification: 16N80, 16S70, 16D25, 13G05. We construct some new examples showing that Heyman and Roos construction of the essential closure in the class of associative rings can terminate at any finite or the first infinite ordinal.
Benini, A., Pellegrini, S. (1992)
Mathematica Pannonica
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Zaks, Abraham (1973)
Portugaliae mathematica
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Agata, Smoktunowicz (2001)
Serdica Mathematical Journal
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The Köthe conjecture states that if a ring R has no nonzero nil ideals then R has no nonzero nil one-sided ideals. Although for more than 70 years significant progress has been made, it is still open in general. In this paper we survey some results related to the Köthe conjecture as well as some equivalent problems.
Tumurbat, S. (2002)
Mathematica Pannonica
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J. J. Malone, C. G. Lyons (1972)
Compositio Mathematica
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Aburawash, Usama A. (1997)
Mathematica Pannonica
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