16Wxx Rings and algebras with additional structure

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