Mathematics Subject Classification 1991

16Wxx Rings and algebras with additional structure ( 0 Dok. )

• 16W10 Rings with involution: Lie, Jordan and other nonassociative structures, See also {17B60, 17C50, 46Kxx} ( 0 Dok. )
• 16W20 Automorphisms and endomorphisms, actions of groups and semigroups and their fixed rings ( 0 Dok. )
• 16W25 Derivations, actions of Lie algebras ( 0 Dok. )
• 16W30 Coalgebras, bialgebras, Hopf algebras, See also {57T05, 16S30-- 16S40}; rings, modules, etc. on which these act ( 0 Dok. )
• 16W50 Graded rings and modules ( 0 Dok. )
• 16W55 ``Super'' (or ``skew'') structure, See also {17A70, 17B70, 17C70}, {For exterior algebras, See { 15A75}; for Clifford algebras, See 11E88, 15A66} ( 0 Dok. )
• 16W60 Filtrations and valuations, generalizations of Euclidean algorithm, completions, formal power series and related constructions, See also {13Jxx} ( 0 Dok. )
• 16W80 Topological and ordered rings and modules, See also {13Jxx} ( 0 Dok. )
• 16W99 None of the above but in this section ( 0 Dok. )