Ein Radikal für Fastringe.
Eine Kennzeichnung endlicher nilpotenter Ringe.
El Radical Primo En Sistemas Triples.
Epis and monos which must be isos.
Erratum to "On rings with a unique proper essential right ideal" (Fund. Math. 183 (2004), 229-244)
Essential Cover and Closure
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.
Étude des sous-modules compléments dans un A-module
Exemples de nil-algèbres et de groupes infinis
Extension-closure and attainability for varieties of algebras with involution